C#

bitmap bmp0,bmp1;

control.Image = bmp0;
bmp1 = bmp0;
(modify bmp1}
bmp0 = bmp1;
control.Image = bmp0;

int iNummericValue = 0;
if (!int.TryParse(myTextbox.Text, out iNummericValue))
    MessageBox.Show("Valie is not numeric!");

Eduard Keilholz wrote:

MessageBox.Show("Valie is not numeric!");

EliottA wrote:

I'm changing all my validation messages to say Valie now.

if (char.IsControl(e.KeyChar))
                {
                    lbl_KeyPressTest.Text = "The key you pressed was a control key";
                }
                else if (char.IsDigit(e.KeyChar))
                {
                    lbl_KeyPressTest.Text = "The key you pressed was a digit";
                }
                else if (char.IsLetter(e.KeyChar))
                {
                    lbl_KeyPressTest.Text = "The key you pressed was a letter";
                }
                else
                {
                    lbl_KeyPressTest.Text = "I don't know what kind of key that was.";
                }

bool IsNumber(string text)
{
    foreach(char c in text)
      if(!char.IsNumber(c))
        return false;
    return true;
}