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Posted 19 Apr 2012

Validating gender dynamically using REGEX

, 19 Apr 2012
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Validating gender dynamically using REGEX


This is to show how we can validate a gender using REGEX. We can validate whether the gender entered is Male or Female using this code. 

Using the code

The following code illustrate how we can check for gender validation 

protected void btnGender_Click(object sender, EventArgs e)
        if (chkGender(txtGender.Text))
            lblGender.Visible = true;
            lblGender.Text = txtGender.Text;
            lblGender.Visible = true;
            lblGender.Text = "Not a valid Gender";
    public bool chkGender(string strGender)
        bool m_flag = false;
        Match match = Regex.Match(strGender, @"^M(ale)?$|^F(emale)?$");
        bool result = match.Success;
        if (result)
            m_flag = true;
            m_flag = false;
        return m_flag;
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default5.aspx.cs" Inherits="Default5" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head runat="server">
    <form id="form1" runat="server">
        <asp:TextBox ID="txtGender" runat="server"></asp:TextBox>
        <asp:Button ID="btnGender" runat="server" OnClick="btnGender_Click" Text="Validate" />
    <br />
    <asp:Label ID="lblGender" runat="server" Visible="false"></asp:Label>


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer
India India
I am working as a Software engineer. Web development in Asp.Net with C#, WinForms and MS sql server are the experience tools that I have had for the past 3 years. Yet to work on WCF, WPF, Silverlight and other latest ones.

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Comments and Discussions

QuestionPoor Pin
Míša Hájková25-Apr-12 3:52
memberMíša Hájková25-Apr-12 3:52 
Suggestion[My vote of 2] Over complicated code Pin
Matt T Heffron19-Apr-12 7:49
memberMatt T Heffron19-Apr-12 7:49 
All of the chkGender method can be replaced with two lines of code:
// This once:
private static Regex ValidGender = new Regex(@"^M(ale)?$|^F(emale)?$");
// This instead of if (chkGender(txtGender.Text))
if (ValidGender.IsMatch(txtGender.Text))

This will be more efficient.
To the Regex constructor you can add the RegexOptions.IgnoreCase for a case-insensitive compare.

Ultimately, it would be even simpler to use Radio Buttons for Male and Female options on the page so the user doesn't need to type anything, and input cannot be invalid.

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