Validation in Windows form using c# in .net

Question

I am doing my project in VS2012 Windows Forms using C#.

My probem is I am validating a textbox when the control loses focus; check it is empty or not. My textbox name is ChildFirstName and my code is:

private void ChildFirstName_Leave(object sender,EventArgs e)
{
    if (ChildFirstName.Text == String.Empty)
    {
        ChildFirstName.Focus();
        ChildFirstName.ForeColor = Color.Red;
    }
}

But this is not working can anybody say what is the actual problem?

What is you goal exactly? I suppose you want the BackColor of the textbox to turn red, right? Not ForeColor — Vahid Nateghi
– Vahid Nateghi, Commented Nov 25, 2013 at 7:55
possible duplicate of C# Validating input for textbox on winforms — Richard Ev
– Richard Ev, Commented Nov 25, 2013 at 7:56

Sandy · Accepted Answer · 2013-11-25 08:02:02Z

1

There is a flaw in the code you have written. ForeColor property is used to define text color and not background color. So in your code you make a check if the there is no text then the change the color of the text to red. It does not make much sense to me.

If you wish to change the background color of the textbox then use BackColor property.

    private void ValidateTextBox(object sender)
    {
        TextBox textBox = (sender as TextBox);
        if (textBox == null)
            return;

        if (string.IsNullOrEmpty(textBox.Text))
        {
            textBox.Focus();
            textBox.BackColor = Color.Red;
        }
    }

Call above method in your leave event of textboxes.

Hope it helps.

answered Nov 25, 2013 at 8:02

Sandy

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