I am trying to execute a scenario which is Deleting the content/value of textbox and then if the textbox is empty it will become 0 automatically.
because every time I execute it it gives me an error like converting string to integer is invalid etc.
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1You should post your code and provide more details please.Máster– Máster2018-06-14 00:39:44 +00:00Commented Jun 14, 2018 at 0:39
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5 Answers
If I understand you question correctly then this is what you need
https://stackoverflow.com/a/41890237/9651031
Dim count1 As Integer = 0
count1 = ConvertToInteger(a.Text) + ConvertToInteger(b.Text) + ConvertToInteger(c.Text)
txt_display.Text = count1
Private Function ConvertToInteger(ByRef value As String) As Integer
If String.IsNullOrEmpty(value) Then
value = "0"
End If
Return Convert.ToInt32(value)
End Function
play around with it and eventually you will get your desired result
1 Comment
Cremlic
You're welcome bud! BTW. this is not my code just sharing it. Cheers!!
In that case, trigger the TextBox_TextChanged event:
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
if me.TextBox1.Trim.Lenght = 0 Then
me.TextBox1.Text = "0"
End if
End Sub
3 Comments
Jeffrey Oliveras
Will try it, Thanks for the feedback
David Wilson
This will result on confusing behaviour for users. If The textbox has 1 digit in it and they delete it to change it to something else, a 0 will appear in the text box. If they try to delete the 0, they won't be able to. While this shouldn't affect the final number, it will be frustrating for the user.
Máster
At least in WebForms the zero
0 won't appear until the textbox loses focus. I don't remember if the same applies for WinForms.Please try this
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) HandlesTextBox1.TextChanged if TextBox1.Text.Trim = "" Then TextBox1.Text = "0" End if End Sub
Comments
Put this on the event in which you want it to happen:
If Textbox1.text = nothing then
Textbox1.text = "0"
End if
Based on your question, I understand that you want the textbox to display the number zero whenever it is empty. Correct?
1 Comment
BuddyRoach
Also, it sounds like you need to learn more on the difference of variable types. So please do some research on that.
You can check what the current text/value is when text changes or when you leave the textbox.
Then you simply do
if textbox.text="" ' or any form of empty/nothing
textbox.text="0"
end if
