[Tips] How to Restrict a C# TextBox to Numeric Input Only

You can use below function. This function can help you just allow input number not characters.

Explore My Other Channel for More Cool and Valuable Insights

👉 Youtube Learn Tech Tips

👉 Tiktok

👉 Facebook:

// Developer: VịLH / Zidane (huuvi168@gmail.com)
// Last Modified: 2016-07-01

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
     if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && (e.KeyChar != '.'))
           e.Handled = true;

      // only allow one decimal point
      if ((e.KeyChar == '.') && ((sender as TextBox).Text.IndexOf('.') > -1))
           e.Handled = true;
}

Thank you for reading this post. I hope you found it helpful and easy to follow. If you have any feedback or questions about How to Restrict a C# TextBox to Numeric Input Only , please share them in the comments below. I would love to hear from you and discuss this topic further

✋✋✋✋  Webzone Tech Tips, all things Tech Tips for web development  - I am Zidane, See you next time soon ✋✋✋✋