Writing a Sub

Question

Hello all, I'm having some problems writing a sub. Below are some screen prints

I made a on screen keyboard using all labels  This app. is for a touch screen. The first pic is the code for all 40 labels using the If Then statement.(Screen print is for Label2 only). Second pic is the Sub I wrote so when you click on anyone of the labels, the labels text appears in the textbox with focus. As you can see the error I keep getting. What in the world am I doing wrong? Thank you for your help.

Answer 1

The VB board is here.  This is the T-SQL board.  To answer your question, I bet that the first time a user clicks a label, TextBox1.Text is null.  Because you reference it in the assignment, you pick up a null reference exception.  You should add another branch to your If statement to check if TextBox1.Text is null before you do something.

Answer 2

Hello

This is a forum for SQL Server Transact-SQL, not for VB.NET

And the answer is, you haven't declared & assigned the variable send in sub "LabelClick"; change it this way:

Private Sub LabelClick(sender as Object)
...
End Sub

Private Sub Label55_Click(sender As Object, e as EventArgs)
    LabelClick(sender)
End Sub

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Olaf Helper
* cogito ergo sum * errare humanum est * quote erat demonstrandum *
Wenn ich denke, ist das ein Fehler und das beweise ich täglich
Blog Xing

Answer 3

Thank you Olaf, it works. I think I need to hit the books again. Thanks again. Sorry about the wron forum.

Answer 4

Little tip; to avaoid such mistakes you should set OPION EXPLICIT ON and as it's best also OPTION STRICT ON.

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Olaf Helper
* cogito ergo sum * errare humanum est * quote erat demonstrandum *
Wenn ich denke, ist das ein Fehler und das beweise ich täglich
Blog Xing

Answer 5

From your images, the variable "sender" is not define within the LabelClick routine, so I am surprised the code would compile. 

 

Within the LabelClick subroutine, right-click on the variable "sender" and choose the option "Go to definition".  Show us the line of code that the IDE displays.

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Mike