how to validate textbox control in vb.net?

[tamilkumaran]

i want validate my controls in vb.net for windows application..
what is the code for my text box accept only characters?
and also accept only numbers?

[sivisr]

hi,
Use e.keychar to accept numeric or what ever you want.

[Shashi Sadasivan]

i want validate my controls in vb.net for windows application..
what is the code for my text box accept only characters?
and also accept only numbers?

please see http://msdn2.microsoft.com/en-us/library/ms229644.aspx
U can use language filter to get it in vb .net :P

[bhar]

Hi,

Private Sub txtCr_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtCr.TextChanged
If Not IsNumeric(txtCr.Text) And (txtCr.Text <> " ") Then
    MsgBox("Not a Numeric Input! Try Again")
    txtCr.Focus()
    Exit Sub
End If
End Sub
 

The above code checks whether numeric data is entered in the Credit text box control. The default event of the TextBox is the TextChanged Event. A textbox communicates that its contents have changed via the TextChanged event.

validating textbox control in C#.net

private void txtCr_TextChanged(object sender, EventArgs e)
{
    if (!(IsNumeric(this.txtCr.Text) == true) & (this.txtCr.Text != " "))
    {
        MessageBox.Show("Not a Numeric Input ! Try again");
        txtCr.Focus();
        return;
    }
}
 
 
Or
 
you can try
 
private void txtCr_LostFocus(object sender, EventArgs e)
{
    if (!(IsNumeric(this.txtCr.Text) == true) & (this.txtCr.Text != " "))
   {
           MessageBox.Show("Not a Numeric Input ! Try again");
           txtCr.Focus();
           return;
   }
    else if (Convert.ToDouble(this.txtCr.Text) < 0)
    {
        MessageBox.Show(“Enter positive Amount”);
        txtCr.Focus();
        return;
    }
}
 

The above code checks whether numeric data is entered in the Credit textbox controls. The LostFocus() event occurs when the input focus leaves the control. The Private void txtCr_LostFocus()event occurs when the input focus leaves the debit text box control.

[rekhareddy]

i want validate my controls in vb.net for windows application..
what is the code for my text box accept only characters?
and also accept only numbers?

hi this rekha
only accepting numbers only
the code is

If (e.KeyChar > Chr(47) And e.KeyChar < Chr(58)) Or e.KeyChar = Chr(46) Or e.KeyChar = Chr(8) Then
        Else
            e.KeyChar = ChrW(0)
            Beep()
        End If