Difference Between ErrorProvider.Clear() And ErrorProvider.SetError(tBox,vbNullString)

Oct 10, 2011

What is the difference between ErrorProvider.Clear() and ErrorProvider.SetError(tBox,vbNullString)

Is there a preference for one or the other?


How To Clear ErrorProvider In 2003

Apr 19, 2012

I would like to ask how to clear the ErrorProvider in VB.net 2003? ErrorProvider.Clear() isn't working in vb2003. i know it's very simple

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Error String Showing Twice In ErrorProvider?

Jul 14, 2009

I'm having troubles with my errorprovider and i already found out what the problem is - the textbox is bounded twice (Display Member and Value have different binding sources) and so the errorprovider is showing the same error twice. If i remove one binding source,everything is fine.Any suggestions?Oh - I'm validating the columns in my DataSet.vb with DataTable_ColumnChanged Sub with table.setColumnError().Another problem ->I have a field (decimal) in my dataset that is optional (can be null). But if the user writes something in and then deletes it so that the textbox is empty, the errorprovider is showing the error "Input string was not in a correct format."

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Handling Multiple Columns With The Errorprovider?

Nov 13, 2009

I have put my business logic in a partial class as suggested in best practices. One of the conditions is that one of four fields of a row has have a value. Setting the errorprovider has no problems when creating a new row in the new row event. All the textboxes in the form show the error condition.

Dim ErrorString As String = "A value is needed for at least one of the " & vbCrLf & "Gallon, Fuel, Oil, or Misc fields"

e.Row.SetColumnError("Gallons", ErrorString)[code]....

The logic that sets them back to a no error condition though only sets the currently focused control in the form to no error. When the error is corrected.

MyFuelRow.SetColumnError("Gallons", "")
MyFuelRow.SetColumnError("FuelCost", "")[code]....

How can you reset multiple column errors at once?

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Reference The Errorprovider On Another Form From A Module?

Aug 27, 2010

How can I reference the errorprovider on another form from a module.

Sample Code:

leaveOptionalTBTextValidation(ByRef TBControl
As custTextBoxControl,
ByRef intMaxChars


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Remove ErrorProvider After Validation In Delegate?

May 6, 2011

I am adding a handler on each form to validate all textboxes for empty strings. 

I have a class that has a procedure for validation

Sub NonEmptyValidate(sender as Object, e as System.ComponentModel.CancelEventArgs)
dim _errorProvider as ErrorProvider
dim _txtBox as TextBox


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Combobox Databinding And The Errorprovider Columnchanged Event?

Nov 12, 2009

I'm having an issue with getting the errorprovider to work in a database application where I have put the error provider logic in a partial class and have a combobox value change.Either I set the bindings so that it works but any navigation in the binding navigator then updates the value of that combobox on every next previous etc or it never fires until the save. So there is no way to change the errorprovider setcolumnerror string to something new with out saving on every navigation move. After changing the selection in the combobox the row does shows dirty (rowstatus) so there is databinding but it doesn't fire the ColumnChanged event like textbox and other controls. Is there a way to keep all this in the business logic in a partial class?

Partial Class reportexecDataSet
    Partial Class fuellogDataTable
Private Sub fuellogDataTable_ColumnChanged(ByVal sender As Object, ByVal e As


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ErrorProvider Not Working Consistently From DataSet.ColumnChanging?

Feb 13, 2012

I have an ErrorProvider on a form with a DataGridView.The Binding Source for the DGV points at a single table in the DataSet (which hooks up to an underlying Access DB).The table has two columns:

1) Autoincrement PK

2) Text field, <=25 chars, unique, can't be Null or empty string

I test for string length (>0 and <=25) in the DataSet.Table.RowChanging event.If it's out of range then I use e.Row.SetColumnError, that passes the error to the ErrorProvider / DGV on the correct row and DataSet.HasErrors returns True. All good, no problems.

I test for uniqueness in the DataSet.Table.ColumnChanging event.If it's not unique I can set the error with either e.Row.SetColumnError or e.Row.RowError; Now it gets complicated since sometime this makes the ErrorProvider / DGV show the error and sometimes not, it depends on whether the DataSet keeps the Unique = True constraint of the underlying DB.

Why would I have the DataSet be False for Unique when the DB is True for same constraint? So that the user interaction with the form has the minimum of dialogue box based interuptions. I am trying to design a system whereby all issues / errors are reported
to the user as they interact with the form in a subtle way, allowing them to keep working but trapping errors before any attempt to Save from the DataSet to the DB.

So, if the DataSet keeps the unique constraint then when you insert the new (duplicate) row the DGV throws its DataError event, a default dialogue appears, behind which the DGV has the ErrorProvider icon on the correct row. However, since the DataError event
causes the problematic change to be rolled back, the new row is removed and the error disappears.

If I change the DataSet requirement to Unique = False, then SetColumnError does not cause an ErrorProvider icon to be shown and DataSet.HasErrors returns False. I can improve upon this slightly by using RowError, this causes DataSet.HasErrors to return True but the ErrorProvider icon still does not show.Further, when using Unique = True on the DataSet, and editing an existing row to be a duplicate of another, the behaviour is the same, DGV.DataError event, roll back of the change but the ErrorProvider icon remains, despite the row no longer being a duplicate and DataSet.HasErrors returns True. The text of the the ErrorProvider tooltip is the one from SetColumnError, not RowError.So, the behaviour of SetColumnError is affected by the state of the DataSet field Unique constraint?

Unique = True
SetColumnError affects the DGV / ErrorProvider and DataSet as expected.
(RowError behaviour unknown)
Unique = False


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ErrorProvider Not Allowing Blank Date TextBox Field

Dec 31, 2009

I'm using the ErrorProvider in VB.Net (2005) which is associated with a BindingSource that is bound to a custom object that I have created. This custom object contains a date field that has a "Date" data type that. I am using a "TextBox" to bind the date field in my form. My issue is, whenever the TextBox loses focus and is blank, "String not recognized as a valid DateTime" is displayed by the ErrorProvider and the focus can't be changed to any other control on the Form. It's good that the ErrorProvider validates entries on Date fields by default (I didn't set up my custom object to display this particular error for the date), but it should allow blank values. I want the user to be able to have a blank date with no error message displayed. How can this be done using a Date field bound to a TextBox?

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Errorprovider Shows Error On Using Windows Close Button(X)

Mar 20, 2010

Is there any way to turn the damned error provider off when i try to close the form using the windows close button(X). It fires the validation and the user has to fill all the fields before he can close the form..this will be a usability issue because many tend to close the form using the (X) button. i have placed a button for cancel with causes validation to false and it also fires a validation.


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Data Errors : DataSet.RowChanging / DataGridView.DataError / ErrorProvider.GetError

Feb 6, 2012

how the various elements that help you handle errors work together. Have tried several options and can't make head nor tail of it. The underlying table has two columns, an autoincrement integer and a text column with the following settings:


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Left Justify The Standard ErrorProvider Icon In Specific DataGridView Cells?

Jul 23, 2010

We would like to have 2 ErrorProviders for a DataGridView. The standard ErrorProvider and another WarningProvider with a different icon. Also is it possible to Left Justify the standard ErrorProvider icon in specific DataGridView cells?

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Difference Between VbNullString And Sting.Empty/""

Mar 13, 2009

Anybody knows what the difference is?

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Set The Tbox Image Background To Transparent?

Mar 17, 2009

Hiwould like to set the tbox image background to transparent>


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Create A CLEAR BUTTON Loop To Clear All Textboxes?

Dec 13, 2011

this is currently my code to clear my 5 textboxes

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click

End Sub

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Clear Dataset But Get Error Sometimes If It Is Empty When Try To Clear It?

May 17, 2009

I have a timer that runs every time by itself, and for the code the runs in it I would like to have it clear the dataset before it does anything, the timer runs every 10 seconds, so I tried to do dataset.clear but it would crash if the dataset had no values

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Clear Hyperterminal - When Press "ctrl+L" Is To Clear Terminal Screen How To Write The Code?

Jun 23, 2011

in hyper teriminal when i press "ctrl+L" is to clear terminal screen how to write the code in vb.net? Hyperterminal is connecting to serial comport.when i try this it work and return line on debug

serialport.writeline ("at+cmgl=1")

i try this but not work and it still show some lines on debug

serialport.writeline (vbcrtl +"L")
serialport.WriteLine("vbCrLf + l")

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.net - Clear() Or Txtbox.Text = "" Textbox Clear Methods

Sep 20, 2010

way to clear textboxes in VB.Net and what is the difference between the two methods? I have also seen people be critical of folk using clear objects on their forms and i can see why but in this case, i am only learning.



txtbox1.Text = ""

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Clear All The Data In Data Grid View Without Clear The Binding Source?

Jul 15, 2009

wan to ask about anyone know the code about how to clear all the data inside the data grid view without clear the binding source...

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Why Did Clear() Clear Both DataTables

Feb 28, 2011

In my winform program (in vb.net) I wrote:

Dim dt As New DataTable
'Get data from DB into dt


But when I run the program, Clear() cleared both dt and dttemp! Why? Aren't dt and dttemp supposed to be two distinct instances of DataTable?

(I finally found a solution - dttemp = dt.Copy() instead of dttemp = dt. But I still can't see why Copy() was necessary in this case.

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StreamWriter Clear (clear The File "make The File Blank Again") And Move

Mar 26, 2010

I am using the StreamWriter to create a log file for my application. However I do not see a method on how to clear the file (make the file blank again). Also before I clear the file I want to rename it so that I can have multiple log files, a new one produced everytime the application runs.


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Clear All Controls Except One?

Apr 3, 2010

I am using the following code to clear all the values of all my controls everytime I click save button....Is there a way to not to clear the value of a certain control inside one groupbox? I would like the radiobutton in one group box will not be cleared...or if it can't be done, how do i put back the selected radiobutton after i click save?[code]....

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Clear All My Fields?

Aug 5, 2009

I have the aplication which requires name fields... and i wan tto clear these fields whenever i closed the application using close(X) button. i dont want to use 'clear' button.

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Clear All Row In Datagridview?

Aug 28, 2011

i m trying to clear my all row in datagridview. Here is simply code


It's almost clear datagridview, but don't save this changes in base. I quite the app and start it again then old row are back.

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Clear All Textboxes Except Three?

Nov 29, 2011

I want to have a button that clears all textboxes except three. This code I got so far which clears all the textboxes except 1


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Clear Bin And Obj Folders?

Jan 10, 2011

Is there any built-in function in vb that allows us to be able to delete our bin/obj folders instead of having me manually delete them myself?

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Clear Out A Pathstring Value

Feb 8, 2011

I need to clear out a pathstring value. I have a command line created from four different text boxes. I have created a button that clears those text boxes, but it does not clear out any data already in the "pathstring". How do I clear it? This is for the coding that executes the pathstring command.


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Clear Out A Tool Tip?

Jan 1, 2012

Is there a way to clear out a tool tip?

I have a field where the tool tip data is changed based on what record they select. It's show each record in different tool tips. I just want to show the current one.

Below is my

Dim lblnotes As ToolTip : lblnotes = New ToolTip
lblnotes.SetToolTip(lblequipment, return_notes_stringtooltip())

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Clear This Summary Box?

Mar 3, 2011

I am a first year diploma in IT student and have this assignment here. Its for a catering business to calculate simply selections of food etc.So after calculation there is a summary to show total sales, number of sales and average sales. After the person clicks Ok i am asked to give them an option to clear summary.Now i need to know if they click yes how do i clear the summary?

Private Sub summaryButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles summaryButton.Click
'Calculate Average and Display Total Sales
Dim returnDialogResult As DialogResult


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How To Clear A Bitmap

May 31, 2010

I've created a bitmap on which I use setpixel to color it in. Then I display it on a picturebox. I want to clear the bitmap form time to time, reset all its pixels. I see no bitmap.clear() method and there's nothing in the documentation that seems. Short of disposing of or setting the bitmap = nothing and creating a new one, how do I wipe a bitmap?

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How To Clear A DataGridView

Apr 9, 2007

How do I clear a DataGridView? Basically I want the user to be able to click the button again that fills it and it will erase everything and refresh the data.

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How To Clear A DataTable

Feb 28, 2009

I have a form with a tabcontrol. The tabcontrol has two pages. The first has a form that the user fills and clicks on a button to store the values on a SQL database. The second has a combobox that is filled on the click event of the button with the values of a field of a database table. I put the filling of the combobox on the button's click event in order to display the new (stored) value. The problem is that if the user repeats the above procedure then the displayed values (in the combobox) are doubled, tripled etc. I tried to clear the datatable that I am creating and filling after assigning its values in the combobox but it doesn't work. [Code]

This code is on the button's click event. But it returns an empty combobox. I can't understand why is doing this as first I am filling the combobox with the values from the datatable and then I clear it. Any suggestions for solving the above problem?

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How To Clear A String

Mar 11, 2009

I have just moved over to Visual basic 2008 express edition. i want to clear a string and don't know how. the vb6 code was: txt = "" but know i does nothing? what do i do to clear the string.

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How To Clear Datagridview

May 5, 2009

I am using datagridview.rows.clear() to empty a grid that i can't clear it. is there another way to empty the grid?

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How To Clear Listbox

Mar 6, 2010

I'm writing a code in which the user is supposed to enter a number less than or equal to 15 and greater than 0.And If user enters a number greater than 15 then he gets an error msg. I do have the right code for error messge but the listbox still shows the result along with the error message box. How do I JUST have the error message.[code]

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IDE :: How To Clear DataRow

Oct 5, 2010

Code is in VB 2008,

In code i am using Datatable, using that select method datarow
Dim dt as New Datatable
Dim dr() as Datarow = nothing


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Sub To Clear All Textboxes Value ?

May 22, 2012

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles Button1.Click
End Sub


This sub is for to clear all textboxes value, i just need to know how did it work ?

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VS 2008 - How To Clear WMP URL

Jan 23, 2012

With every sheet music file opened, I am also loading background music file, if such exists. If music file doesn't exists, I need to clear the previous one from the sourceURL, otherwise I have wrong music playing with wrong notes. How can I do that?

Sub Play_BackgroundSoundFile()
Player.settings.autoStart = False
Dim urlpath As String = (Application.StartupPath & "UserMIDILibrary")
Dim fname As String = Path.GetFileNameWithoutExtension(pathload)
fname = fname & ".mid"
[Code] .....

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Way To Clear A Datatable

Feb 12, 2009

I am filling a datatable and after storing the values I want in two variables I want to clear my datatable or erase it.[code]...

As the above code is in a function (and I am calling this function many times) it causes me problems. The variables id and entitycode store the first values (the first time I run the function) and then it always use them. That's why I want after storing the values in variables to also clear the datatable or even erase it (and rebuild it when I rerun the function).

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Way To Clear Clipboard

Jul 13, 2010

I would like to clear clipboard

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