TextBox text format in C#

Question

I want something like this 01 or 02 or 03 but not 00 in my textbox ie both the digits allowed in the textbox should not be 0.

Again clearly I don't want first 0 followed by second 0 in textbox. So do anyone has got idea?

Answer 1

In your format string (when you call ToString) you can use a ; character to define a "zero" format like this:

myTextBox.Text = myNumber.ToString("00;;Something");

MSDN Custom Numeric Formatting: Semicolon Separator

Answer 2

if the content of your text box value is integer, cause it's not clear form your quesiton, can use something like this:

public string GetFormattedString(int iValue) {
    if(iValue!=0)
      return iValue.ToString("00");

    return string.Empty;
}

This returns '01', for example, and for 0 returns "".

If it's not ok, please explain better what you actually need.

Regards.

Answer 3

您可能还想尝试MaskedTextBox吗？

Answer 4

Don´t know if you mean it so. But you can use the TextChanged Event.

  private void textBox1_TextChanged(object sender, EventArgs e)
  {
     if (textBox1.Text == "00")
     {
        textBox1.Text = "";
     }
  }

If the Text in the Textbox changed, you can check if the Text is "00". Then you can handle it, in my example the Textbox is empty again.

Hope that I understand you right and could help you.

Answer 5

if you want to validate input text from textbox control you can use the Regex in your case it will be like this

        string strRegex = @"^\d[1-9]$";
        Regex myRegex = new Regex(strRegex);
        string strTargetString = @"03"; // put here value from text box
        if (myRegex.IsMatch(strTargetString))
        {
            MessageBox.Show("Correct");
        }
        else
        {
            MessageBox.Show("Incorrect input");
        }