New programmer problems

[PSU_Justin]

I'm trying to implement a simple conversion utility into my VB program. I want the utility to check my text box to see if it is empty, if it is to leave it empty, if not to run the conversion.

 

This is the Code I have been working with that doesn't quite work.

 

Dim dConv As Single

       If dTxtBx Is "" Then
           dConv = 0
       Else
           dConv = dTxtBx.Text
           dConv = dConv / 3.28083
           dTxtBx.Text = dConv
       End If

 

I think my problem is related to the is "" statement. I'm not getting a specific error, but it appears that if the text box is blank the loop is jumping to the else statement and failing at the dconv=dtxtbx.text statement. (this is the first time I tried to put code into a post, hope I did it right.)

[stustarz]

Try

 

Dim dConv As Single

       If dTxtBx.text Is "" Then
           dConv = 0
       Else
           dConv = CInt(dTxtBx.Text)
           dConv = dConv / 3.28083
           dTxtBx.Text = dConv
       End If

[Heiko]

"Is" is the operator for comparing objects. In your case you want to compare values. The dTXTBx.Text property I presume (not the whole object, as your code does) with a string "".

 

Try

 

If dTxtBx.Text = "" Then ....

[stustarz]

Fancy that - you get two identical answers posted at exactly the same time!!!

[divil]

Not identical - yours won't work :)

 

The best way would be comparing Textbox1.Text.Length to 0.

[stustarz]

But

 

If textbox.text = "" Then
'Do Something
End If

 

Would work. This would check to see if the text is null and return true if the textbox is empty.

 

I left the 'is' in my original code, should have been = missed that one!

[PSU_Justin]

Thanks I got it to work!

[PSU_Justin]

Both ways appear to be working well.

[Derek Stone]

There are roughly a dozen ways in .NET to determine if a String object has no length. The more common ones include the Length property and the String.Empty field. Whichever one you choose, use it consistantly.