CustomValidator

The CustomValidator control allows to write a method to handle the validation of the value entered.There are validation controls for ensuring that there is some text present in a text field, for validating the range of data typed in, comparing two fields for values and for validating the input against a Regular Expression.BackColor  	The background color of the CustomValidator control.

Properties:
1.ClientValidationFunction ::Specifies the name of the client-side validation script function to be executed. Note: The script must be in a language that the browser supports, such as VBScript or JScript With VBScript, the function must be in the form:
        Sub FunctionName (source, arguments)
With JScript, the function must be in the form:
        Function FunctionName (source, arguments)
2.EnableClientScript ::A Boolean value that specifies whether client-side validation is enabled or not
3.Enabled ::A Boolean value that specifies whether the validation control is enabled or not
4.ErrorMessage  ::The text to display in the ValidationSummary control when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set
5.ForeColor  ::The foreground color of the control
6.id  ::A unique id for the control

 ::A Boolean value that indicates whether the control specified by ControlToValidate is determined to be valid
 ::Specifies the name of the server-side validation script function to be executed
 ::The id of the control to validate

 CustomValidator 
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<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="CustomValidator .aspx.cs" Inherits="_Default" %>












    CustomValidator    


    
   
    
    
                          
        
       
        
        "Text must be 10 characters"
    
     
        

                                     
        

                                           
        
   
        

                                 
    
    
    


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.CS Code
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using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (Page.IsValid)
            Response.Write("Page has passed validation.");

    }
}