How to set validation to textbox using two radiobuttons

AKSHAY HARSHA

11y1.4kLearn iOS Programming

I have 1 text box - Textbox1

2 Radiobuttons - Rb1,Rb2.

my problem is

if i select Rb1- Textbox1 accept only numeric values.

Rb2 selected - Textbox2 accept alphanumeric values only

plz help me

6 Replies

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Manish Kumar Choudhary11y ago

Accepted 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/

Rakesh11y ago
Create two radio buttons and one text box and use the Code I provided
AKSHAY HARSHA11y ago
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 HARSHA11y ago
Dear Manish Kumar Choudhary
Could you plz explain with example.. i need it
Rakesh11y ago
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 V11y ago
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;
}