.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.Clear()

or

txtbox1.Text = ""

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[Code]...

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[Code]...

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Feb 28, 2011

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Dim dt As New DataTable
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'...

[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.

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[Code]....

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[code].....

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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.

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After I have entered data into 12 textboxes and pressed a button to execute the code, the data from the text boxes goes into a database.I want to clear the information in the text boxes after the button has been clicked, at the moment I have 12 lines of code which are similar to this.

MsgBox("Data Has been Added to The Database")
tbeventId.Clear()
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Jul 20, 2010

I have a button that inserts data into a database.With that button I want it to serve two functions.One for insert and one for clearing the textboxes after the insert is done.I did a little bit of digging around and her is a code snippet that i found online:

Dim ctrl As Control
For Each ctrl In Me.Controls
If TypeOf ctrl Is TextBox Then ctrl.Text = ""

[code].....

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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

[code]....

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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[code]....

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