Clear All My Fields?
Aug 5, 2009I 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.
View 3 RepliesI 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.
View 3 RepliesThe vb.net "WithEvents" syntax is very useful, but if a WithEvents field which references a long-lived object is not nulled out, it will often constitute a memory leak.Is there any easy way for a Dispose routine to have vb.net automatically clear out all WithEvents fields and unsubscribe them?
I've figured out a nice way to wrap the creation of disposable fields so that they will be automatically Disposed when the containing object is disposed, without having to individually list such objects. Is there any way to take care of WithEvents fields without having to manually null them out in the Dispose routine?
EDIT:Since there was no response indicating a built-in way to do it without reflection, is there any built-in means of using reflection to determine whether a particular property is a VB automatic implementation of a WithEvents "field"? I know that a WithEvents "field" called "foo" is implemented as a property called "foo" and a field called "_foo", but that's such a common naming pattern that I wouldn't count on it. Is there some attribute that could be used to determine which properties need to be auto-nulled?
I have a web page that has a few text fields, and a reset and submit button. I'm having trouble getting the reset button to work to clear the text fields because the required field validators and regular expression validators are blocking any code in the reset button's click event from occurring. how to get the validators to not activate when the reset button is clicked? One method I tried was to set the enabled property of all the validators to false in the reset button's code block but no luck.
View 3 Repliesthis is currently my code to clear my 5 textboxes
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
TextBox1.Clear()
TextBox2.Clear()
TextBox3.Clear()
TextBox4.Clear()
TextBox5.Clear()
End Sub
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
View 4 RepliesI'm currently refactoring an old Visual Basic DLL (VB.Net), which stores all of its data in one module called Globaldefinitions as public fields. There are about 200 fields, referenced thousands of times all around the code:
Public Module Globaldefinitons
Public a As Short
...
Public zz10 As Double
[Code]...
I need to change the module into a class with non-shared fields. This means, each and every of these thousands of references needs to reference the instance of that class:
globalDefinitionsInstance.a = 5
How do I go about this efficiently?
Regular expressions operating on the source fall flat. Refactoring tools like Re-Sharper or CodeRush don't seem to offer this functionality. Visual Studio 2010 cannot do it automatically either.
Class Foo
ReadOnly name As String
Public Sub New(name As String, dependentUpon As Foo)
Me.name = name
[code]....
The output of New Bar() is:
Dependent created. Dependent upon nothing.
Independent created. Dependent upon nothing.
It seems fields are initialized in the same order as they appear in the source code, which (a) leads to an unexpected result, and (b) seems a little puzzling, given that one is normally not permitted to read from uninitialized variables in .NET, yet that seems to be working fine above.I would've expected VB.NET to be smart enough to initialize referenced fields first, and only then those that reference it; i.e. I'd have liked to see this output instead:
Independent created. Dependent upon nothing.
Dependent created. Dependent upon Independent.
how to get VB.NET to behave like that instead, without simply having to swap the declaration order of dependent and independent inside class Bar?
I'm trying to create a table in Word using data from a table in Access. There are four fields in the access table that I need. 3 fields are text which I can populate the Word without any issues. However the fourth field is a memo with >255 characters.I'm struggling to come up with the proper code to allow me to populate the Word field with the memo data that has more than 255 characters. The code I have so far is listed below. But when it hits the memo field, it crashes on the line I marked with **. I know it's not text, but I've tried many different field types, but nothing has worked so far.[code]...
View 1 RepliesMy intent is to have the code - on a button.click event - check the Username and Password fields and return an error depending on which is wrong. Or if both are wrong, return a different error message. I've set the username as parts and the password as parts (still learning how to use external authentication). [Code]
View 2 RepliesI have several sqldatasources for my gridview. All of the columns are autogenerated. However they all have some consistent fields and I'd like to make those fields template fields so I can modify the edit template for them such as adding a drop down menu. Is this possible?
View 1 Repliesin 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")
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.Clear()
or
txtbox1.Text = ""
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...
View 1 Repliesexperience on how to create an engine using C# (VB.NET is okay too) that is generic enough to handle most cases of MS Word text fields I need to fill with data I'm getting from a database? In short, I'm about to embark on this little Office automation excursion and I'm hoping a little bit of feedback here.
View 2 RepliesI have a table which contains a list of products for a company. They input data about how much stock they have and also the level at which they want to be reminded that they need to order new stock.
[Code]...
I want to list all the true results in a form which the user is then able to navigate through. What would be the best way to go about doing this?
In my winform program (in vb.net) I wrote:
Dim dt As New DataTable
'Get data from DB into dt
'...
[Code].....
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.
how to execute this SQL Statement
Scenario:
Given Tables T_Data, T_AllDesc, T_System1, T_System2
Given Fields:
T_Data= f_id, f_Desc, f_CreationDate, f_CreationTime, f_System1, f_System2
[Code].....
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.
[Code]...
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]....
View 15 Repliesi m trying to clear my all row in datagridview. Here is simply code
Me.DatabaseDataSet.Clear()
Me.StuffTableAdapter.Update(Me.DatabaseDataSet)
Me.DatabaseDataSet.AcceptChanges()
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.
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
[code]....
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?
View 4 RepliesI 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.
[Code]...
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())
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
[code]....
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?
View 8 RepliesHow 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.
View 17 RepliesI 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?
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.
View 2 RepliesI am using datagridview.rows.clear() to empty a grid that i can't clear it. is there another way to empty the grid?
View 1 Replies