C# - How to make a textbox that only accepts numbers or only characters

C# - How to make a textbox that only accepts numbers or only characters

                                                                                                                                                           

in this c# tutorial we will see how to make a textbox that only accepts numbers or only characters in C# .


Project Source Code :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class TextBox_Numbers_Characters : Form
    {
        public TextBox_Numbers_Characters()
        {
            InitializeComponent();
        }

        private void TXTB_ONLY_CHAR_KeyPress(object sender, KeyPressEventArgs e)
        {
            if(!char.IsControl(e.KeyChar) && !char.IsLetter(e.KeyChar))
            {
                e.Handled = true;
            }
        }

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

        private void TXTB_CHAR_AND_NUMBER_KeyPress(object sender, KeyPressEventArgs e)
        {
            // allow digit + char + white space
            if (!char.IsControl(e.KeyChar) && !char.IsLetterOrDigit(e.KeyChar) && !char.IsWhiteSpace(e.KeyChar))
            {
                e.Handled = true;
            }
        }

    }
}


=> OutPut :

Textbox Accepts Only Numbers Or Only Characters
Textbox Accepts Only Numbers Or Only Characters In C#





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