Please Help Me

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I keep getting the following message,After implementing the my code.

'unable to cast object of type "system.windows.forms.buuton" to type
"system.windows.forms.TextBox"'

my code :

VB

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim NewTextBox As Boolean = True
        Try
            For Each txt As TextBox In Me.Controls
                If txt.Text = "" Then
                    NewTextBox = False
                End If
            Next
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub

Help Me Please?

Posted 22-Jun-10 9:51am

ehsan5000

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William Winner · Accepted Answer · 2010-06-22T10:30:00

Me.Controls contains every control placed on the form. It will go through every control and try to implicitly cast it as a TextBox the way you've set it up. You need to rewrite your code to check whether it is a TextBox first.

VB

For Each ctrl As Control in Me.Controls
  If TypeOf ctrl Is TextBox Then
    If Ctype(ctrl, TextBox).Text = "" Then
      NewTextBox = False
    End If
  End If
Next

And none of that needs to be in a Try/Catch block. It should never throw an unhandled error.