How to Create a String Validation TextBox Using C#.

Submitted by janobe on Friday, May 17, 2019 - 08:38.
In this tutorial, I will teach you how to create a string validation textbox using c#. This method has the ability to accept a string/alphabetic characters only in a textbox. This is a simple and smart way to achieve this string validation textbox. Let’s begin.

Creating Application

Step 1

Open Microsoft Visual Studio 2015 and create a new windows form application for c#. ps1

Step 2

Do the form just like shown below. ps2

Step 3

Press F7 to open the code editor. In the code editor, add a namespace to access regular expression libraries.
  1.  
  2. using System.Text.RegularExpressions;

Step 4

Create a method for the string validation.
  1.  
  2.         private static Regex StringValidation()
  3.         {
  4.             string Pattern = @"^[a-zA-Z]+$";
  5.  
  6.             return new Regex(Pattern, RegexOptions.IgnoreCase);
  7.         }

Step 5

Initialize the method that you have created.
  1.  
  2.         static Regex validate_string = StringValidation();

Step 6

Write the following code to verify a textbox when the button is clicked.
  1.    
  2.         private void button1_Click(object sender, EventArgs e)
  3.         {
  4.             if (validate_string.IsMatch(textBox1.Text) != true)
  5.             {
  6.                 MessageBox.Show("TextBox accepts only alphabetical characters", "Invalid", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
  7.                 textBox1.Focus();
  8.                 return;
  9.             }else
  10.             {
  11.                 MessageBox.Show("Accepted!.");
  12.             }
  13.         }
For any questions about this article. You can contact me @ Email – [email protected] Mobile No. – 09305235027 – TNT Or feel free to comment below.
Tags
string validation in c#
c#
Accept string only in a textbox

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