Validate a Textbox in ASP .NET without Validation Controls

Question

Validate a Textbox in ASP .NET to accept the below input without using validation controls 1. Accepting only numeric input 2. Accepting only characters. 3. Accepting alphanumeric input. Note: Provide clear explanation with comments which is used for what purpose. Task1: First use without using javascirpt Task 2: With Javascript achieve the solution for the above

Srinivas Pabballa · Answer

provide the code under textchanged event of textbox i dont think we have keypresse event in asp .net textbox.. check that and reply once again

Srinivas Pabballa · Answer

provide the code under textchanged event of textbox i dont think we have keypresse event in asp .net textbox.. check that and reply once again

Munesh Sharma · Answer

http://www.aspsnippets.com/Articles/Allow-only-numeric-value-numbers-in-TextBox-using-JavaScript.aspx http://www.dotnetlearners.com/javascript/allow%20only%20alphabets%20in%20a%20textbox%20using%20javascript.aspx

Rajeesh Menoth · Answer

Hi, Accepting only numeric input private void textBox1_KeyPress ( object sender , KeyPressEventArgs e ) { e . Handled = ! char . IsDigit ( e . KeyChar ) && ! char . IsControl ( e . KeyChar ); } if (! System . Text . RegularExpressions . Regex . IsMatch ( textbox . Text , "^[0-9]*$" )) Only letters: Regex . IsMatch ( input , @"^[a-zA-Z]+$" ); Accepting alphanumeric input. Use the expression: ^[ a - zA - Z0 - 9 ]* $ ie: Regex r = new Regex ( "^[a-zA-Z0-9]*$" ); if ( r . IsMatch ( SomeString )) { ... }

Munesh Sharma · Answer

allow only characters to textbox http://www.c-sharpcorner.com/Blogs/10605/allow-only-character-to-textbox.aspx //Only numeric private void txtHomePhone_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar >= '0' && e.KeyChar { e.Handled = false; //Do not reject the input } else { e.Handled = true; //Reject the input } } // TextBox only accept alphabetic characters private void textBox1_TextChanged(object sender, EventArgs e) { if (!System.Text.RegularExpressions.Regex.IsMatch(textBox1.Text, "^[a-zA-Z]")) { MessageBox.Show("This textbox accepts only alphabetical characters"); textBox1.Text.Remove(textBox1.Text.Length - 1); } }