Question

I’m developing a kind of calculator for the Windows Phone.

It doesn’t need to use decimals. (who needs .39 of a brick)

How would I detect that there is a decimal in a string or a textBox?

EDIT: Thanks, @Bala R and @Afnan. But what I was after was something that filtered out letters as well. My answer’s below.

Answer 1

Modyfying the Bala R code gives

private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (textBox1.Text.Contains(".") || textBox1.Text.Contains(","))
                textBox1.Text = textBox1.Text.Replace(".", string.Empty).Replace(",", string.Empty);
        }

this will remove the invalid characters that are entered as the input is written