Clear Combo Box Contents In .net?

Mar 16, 2010

If for textbox it is textbox1.clear, etc.What is the equivalent for combobox to clear the value.


Clear Contents From Datagridview?

Dec 31, 2008

I have a form with a datagridview on it. I have a save button that saves the data from the datagridview to the database.After the button (save) is clicked I want the datagridview to be cleared of the data that is present in the dataGirdView.

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Clear Contents Of A Datagridview?

Jul 22, 2009

How can i clear  the contents of a datagridview.[code]...

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Clear Contents Of A Panel?

Feb 21, 2010

I am doing a school project and have created a small program that allows the user to create a binary search tree and then visually displays it on the screen as a familiar tree structure, how the addition, deletion of nodes in the tree works along with many other things such as different tree traversals. I currently using a large panel on the main form and then adding user controls containing a textbox that displays imputed values,then using the panels paint event I draw a line between the user controls, this works fine however for deletion of a node I need to clear the main panel of the nodes that will change and add them to the panel again or just clear the hole panel and redraw the whole tree

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Clear The Contents Of A Csv File From VB?

Feb 16, 2011

I need to delete/clear all data from an existing csv file from Visual Basic. This seems really simple but I have had a lot of problems making it happen!

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Clear A Listbox Of Its Entire Contents?

Jul 22, 2010

I'd just like to know how to clear a listbox of its entire contents. I know in VB6 it was something along the line of 'lstBox.Clear', but that doesn't seem to be the case in this new version of VB.

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Clear The Contents Of A Listbox And All Other Feilds

Mar 10, 2009

how I can clear the contents of a listbox and all other feilds.this is what I have upto now, and this clears texbox, checkboxes ect... but it wont clear contents that appears in a listbox:


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How To Clear All Contents Of String Array

Oct 28, 2009

I have this:
Dim split As String() = temp_string.Split(",")
''#feed all info into global variables
patient_id = split(0)
doc_name = split(1)
lot__no = split(2)
patient_name = split(3)
How do I clear all the contents of split() ?

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CheckBox Unchecked - Clear Contents In RichTextBox

Jul 2, 2009

I am using the following code for a checkbox, if checked it should print the text defined, unchceked, it clears the items in the ricktextbox. My problem is it prints fine (lets say it prints two lines) as defined, when I uncheck, it clears the text in rich text box, but when I check again, the text appears in the richtext box, but displayed from 4th line. I need to restart from the beginning/ or at least from the next available line. I cant use clear() since it erase all the contents as i have another 3 checkbox items placed.

If CheckBox1.Checked Then
richtextbox.SelectionColor() = Color.Blue
richtextbox.AppendText(CheckBox1.Text.ToString + vbNewLine)
End If

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Clear Combo Box Before Load?

May 5, 2010

I am having a function which populates a combobox (cmbProjtype) as shown below,

I am trying to clear cmbProjtype before I populate again to remove duplicates whenever the function is called, but the line of code added (highlighted) is not doing it.[code]....

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Clear Combo Boxes With Button?

Mar 20, 2010

I need to know how to clear what is currently in the combo box with a 'Clear' button. Basically, I have a combo box with a list of destinations for the user to choose from. Say the user selects Australia, when I click a clear button, I need this selection to disappear, and be ready for the next user to select a destination.

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Combo Box Clear On Button Click?

Sep 4, 2010

I have a combo box that I have set with different names. This is not connected to a database. I simply want to clear the combo box for the user to input the next customers information. I am using a button to do this and my button name is btnclear.

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Clear The Contents Of The Datagridview So That When Each Option Is Selected Only That Data Is In The Grid?

Jun 22, 2009

Class LoanCalc
Private Sub butCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles butCalc.Click
'This procedure executes when the user clicks the Calculate

'button to produce a loan payment based on the requirements

'as stated in the service request.

'Variable Declarations

Dim douPrincipal As Double = Me.txtPrincipal.Text
Dim douInterest() As Double = {5.35, 5.5, 5.75}[CODE]......

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Sql - Clear A Combo Box When Pulling Information From A Database?

Mar 29, 2012

We are writing a program that pulls a Teacher from a database, then you select the "period" 1 - 7. What is happening is if we pick period 1 on teacher john doe. Then when you pick another teacher it doesn't clear the period that we selected before. How do we clear this information every time we select a different teacher?

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Unable To Clear The Contents Of A Text Box (Visual Studio 2010, .net Windows Application)?

Mar 18, 2011

What I have is on my form there are several text boxes.  These text boxes are for user input and attached to each text box is a Private Sub txtBox1_KeyPress function.  In that function I have some validation code to check that the user is inputing only what I want them to.  And if it doesnt it will pop up a message box telling them so, then it is supposed to clear the text box so the user can try again.  But no matter what I try, the text box does not clear it still keeps the last character typed (the invalid one).

Here is the code for one of the text boxes.

Private Sub txtLanIp_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtLanIp.KeyPress
Dim strEmpty As String = ""
If Char.IsDigit(e.KeyChar) = True Or Char.IsPunctuation(e.KeyChar) = True Or Char.IsControl(e.KeyChar) = True Then
'do nothing


The commented methods at the bottom are some of the other things ive tried to make this work.  The txtLanIp.text.clear() is what ive tried from the beginning.  I have also tried setting the text to "",  I even created an empty string and set the .Text value to it but no matter what it wont remove that character.  I have also tried various trim(), len(), Select() functions, most either give me an 'index out of range error', a 'length cannot be less than zero' error or a general ExceptionOutOfBounds error.  I am just tearing my hair out as to why the simple way doesnt work, there is no logical reason why and it gives no error it just doesn't clear the box. 

I have also tried moving the validation to a _LostFocus but e.KeyChar isnt a valid method or property for that declaration, which doesn't surprise me but I wanted to try everything.I dont see how it would matter in this case but I am running Windows XP Pro SP3,  though I also see the same behavior in Windows 7 64 bit ultimate sp1 and windows 7 64 bit pro.

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How To Combine Combo Box Contents

Mar 16, 2010

I have this, birthday selection which is in 3 combobox, 1 for month, 1 for day and 1 for year. But my database table has only this birthday attribute(no year, month or day).
How can I combine the items that are selected in those 3 combo boxes so that they would be fitting in the birthday column?

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Save Contents Of Combo Box To Access Later?

Dec 14, 2010

I have a combo box, that i have linked to a text box, to save continious data. How would i save the contents of that combo box?

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VS 2008 - Colorize Contents Of A Combo Box

Sep 4, 2010

is it possible to colorize the contents of a combo box ? Practically I'd like the various texts in the combo box to have various colors (i.e. the first element to be in green color , the second in red etc) . I know this might sound funny but if it is possible it would be fun to use it !

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Display The Contents Of A Cell (excel) Into A Combo Box

Jan 25, 2011

I need some help displaying the contents of a cell in excel into a combo box. I've been able to display if the contents of excel are numbers but can't seem to figure out how to display text.

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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 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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Copy Contents Of One Array Of Booleans To Another, Preserving Contents But Adding Additional Boolean Values?

Nov 11, 2010

i have an array of booleans whose current boolean values I want to preserve but add additional length to the array? How can I achieve that?  My code looks like this:

Dim Array() As Boolean
Dim ArrayInterimShort() As Boolean
ReDim Array(119)


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Validate The Contents Of A MaskTextBox With Contents From An Array Or List?

May 10, 2011

I am trying to create a code where I placed sets of numbers in an array.I'll use a masktextbox to have the user enter the numbers to match what's in the array. If the user enters the number, ex: social, and the data is correct (matches the numbers in the array), something happens if the number entered in the masktextbox does not match any of the number sets in an array then another thing happens.The masktextbox so far only validates format and gets number only, however, I want the number entered to match whats in the array. 

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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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Pick A Word In Combo Box A That Has Specific Words/phrases In Combo Box B Show?

Feb 24, 2009

i wanted to link options selected from Comb box A (general) to specific options in combo box B (specific). I want to pick a word in Combo box A that has specific words/phrases in Combo Box B show. But not all the words to show in the combo box B if they aren't associated with the Word picked in Combo Box A. Ex.When "Soda" is picked in A, only "Coke, Sprite, Fanta" should be visible in combo box b, not everything else.This is the code i used to make the boxes, but i don't know how to link them.

Private Sub MainForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
' fills the combo boxes with values


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Use A Databound Combo Box To Display One Field In The Drop Down And Another As The Combo Box Text On Roll Up?

Feb 21, 2012

How to use a databound combo box to display one field in the drop down, and another as the combo box text on roll up? Using VS 2005... For example, I have a datatable that has 2 fields. One called "ShortDesc" and one called "LongDesc". I want to be able to see the "LongDesc" column values in the drop down on the combo box. When I make a selection, I want the text in the combo box to read the corresponding "ShortDesc" value.


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Object Null Combo - Error When Try To Populate Some Combo Boxes With A Value

Nov 16, 2011

I am getting an error when i try to populate some combo boxes with a value, the combo box has values in and the right amount the code is getting the right number.

the error msg is "Object reference not set to an instance of an object."

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One Combo Box Fills Another And Hits The Second Combo Box's Lost Focus Event?

Jun 7, 2012

Combo box 2 is filled based on a selection made in combo box 1 and a listview is populated based on the selection made in combo box 2.When the LostFocus event completes in combo box 1, it hits the LostFocus event in Combo Box 2 but it shouldn't.  How do I prevent this from happening or if I can't prevent it, how do I work around it?  The following is the code used. 

  Private Sub cboCategory_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles cboCategory.LostFocus


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Why Did Clear() Clear Both DataTables

Feb 28, 2011

In my winform program (in 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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Javascript - Change Values In Combo Box By Selection In First Combo Box?

Jan 12, 2012

I've got some code like the following. I want it so that when I chose an item in 'select 1' it changes the in the second combo box but I'm not sure of the best way to go about it. Does it have to be AJax or can it be done with just Javascript?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">


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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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Datagridview Combo Box - Set A Single Cell As A Combo Box?

Feb 13, 2009

is there a way to set a single cell as a combo box? it looks to me that you can only set the whole column.

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Forms :: Selected Item In Combo Box Will Not Appear In Another Combo Box?

May 27, 2011

how do i program by saying if a certain item is selected in a combo box then that item will not appear in a second combo box. i have this code for now but it does not work


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Programmatically Add Combo Box Items To A Combo Box In A Datagrid?

Mar 11, 2010

I know how to add the items during design time but how do you add the items through code. I want to fill the combo box in the datagrid with the results of an SQL query?

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Enable/Disable Combo Box From Another Combo Box?

Feb 7, 2011

I have a form with 8 combo boxes and would like to disble certain combo boxes, depending on what was selected in another combo box.  The reason is so the user will not have a blank return on a query.  The first form I created like this worked great, no issues.  This form only allows one combo box (Number_of_Lightheads) to disable any others.  Below is the code I have for this Form. why the other combo boxes will not disable the ones that are called out in the code?

Option Compare Database
Private Sub High_Def_AfterUpdate()
If Me.High_Def = Yes Then


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Selected Item In Combo Box Will Not Appear In Another Combo Box?

May 27, 2011

how do i program by saying if a certain item is selected in a combo box then that item will not appear in a second combo box i have this code for now but it does not work

j = 0
Do While j < cmbSession.Items.Count
If (j <> lesson) Then


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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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