How to set validation to textbox using two radiobuttons

Question

I have 1 text box - Textbox1 2 Radiobuttons - Rb1Rb2. my problem is if i select Rb1- Textbox1 accept only numeric values. Rb2 selected - Textbox2 accept alphanumeric values only plz help me

Manish Kumar Choudhary · Answer

Hi AKSHAY HARSHA  Use a CustomValidator that implements it's own regular expression logic based on a conditional operator. In other words: public void someCustomValidator(object obj ServerValidateEventArgs e) { string expression =  ; if (RadioButton1.Checked) { expression = number validation regular expression ; } else if (RadioButton2.Checked) { expression = alphanumeric validation regular expression ; } if ( Regex . IsMatch ( textBox . Text  expression  RegexOptions . IgnoreCase )) e . IsValid = true ; else e . IsValid = false ; } For regular expression go through following article http://www.c-sharpcorner.com/UploadFile/ee01e6/important-list-of-regular-expressions-and-its-uses/

Rakesh · Answer

Create two radio buttons and one text box and use the Code I provided

Rakesh · Answer

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 WindowsFormsApplication3 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void textBox1_KeyPress(object sender KeyPressEventArgs e) { if (radioButton1.Checked == true) { char ch = e.KeyChar; if (!Char.IsDigit(ch) && ch != 8) { e.Handled = true; } } else if (radioButton2.Checked == true) { if (Char.IsLetterOrDigit(e.KeyChar) // Allowing only any letter OR Digit|| e.KeyChar == '\b') // Allowing BackSpace character { e.Handled = false; } else { e.Handled = true; } } } } }

Rajagopalan R V · Answer

Hi AKSHAY HARSHA . In Your aspx Page td > asp : TextBox ID =tbx1 runat =server Visible=  false > asp : TextBox > tbx1  validationexpression=^[0-9]{4}$ errormessage=Please enter a 4 digit number! /> asp : TextBox ID =tbx2 runat =server Visible=  false > asp : TextBox > tbx2  validationexpression=[0-9a-zA-Z' ']{5} /> td > td > asp : RadioButtonList ID =radioButton1 runat =server AutoPostBack =true OnSelectedIndexChanged = radioButton1_SelectedIndexChanged> asp : RadioButtonList > td > td > asp : RadioButtonList ID =radioButton2 runat =server AutoPostBack =true OnSelectedIndexChanged = radioButton2_SelectedIndexChanged> asp : RadioButtonList > td > In Your cs Page protected void radioButton1_SelectedIndexChanged ( object sender EventArgs e) { tbx1.Visible=true; tbx2.Visible=false; } protected void radioButton2_SelectedIndexChanged ( object sender EventArgs e) { tbx1.Visible=false; tbx2.Visible=true; }

AKSHAY HARSHA · Answer

Dear RAJAGOPALAN RV i have only 1 textbox with 2 radiobuttons.. your code is working while two texboxes with 2 radiobuttons. plz understand my question and give reply

AKSHAY HARSHA · Answer

Dear Manish Kumar Choudhary Could you plz explain with example.. i need it