ServerSide Validation Class

Server Side Validation Class Class Name= validate.cs


using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

/// <summary>
/// Summary description for validate
/// </summary>
public class validate
{
    public validate()
    {
       
    }
    public static IDictionary<string, Regex> RegexDictionary = new Dictionary<string, Regex>() {
        { "Phone", new Regex("\\d{10}")},
        { "Email", new Regex(@"^(([^<>()[\]\\.,;:\s@\""]+"
          + @"(\.[^<>()[\]\\.,;:\s@\""]+)*)|(\"".+\""))@"
          + @"((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
          + @"\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+"
          + @"[a-zA-Z]{2,}))$"
        )},
        { "URL", new Regex(@"(http(s)?://)?([\w-]+\.)+[\w-]+(/[\w- ;,./?%&=]*)?")},
        { "ZipCode", new Regex("^[0-9]{6}$")}
        };

    public string IsPhoneValid(string phone)
    {
        if (!RegexDictionary["Phone"].IsMatch(phone))
        {
            // Phoneno should be digits only
            return "Phoneno Must be of 10 digits only";
           
        }
        else
        {
            return "";
        }
    }
    public string IsEmailValid(string email)
   
    {
        if (!RegexDictionary["Email"].IsMatch(email))
        {
            // EmailId is invalid
            return "EmailId is invalid";
           
        }
        else
        {
            return "";
        }
    }
    public string IsURLValid(string url)
    {
        if (!RegexDictionary["URL"].IsMatch(url))
        {
            // URL is invalid
            return  "URL is invalid";
         
        }
        else
        {
            return "";
        }
    }
    public string IsZipCodeValid(string url)
    {
        if (!RegexDictionary["ZipCode"].IsMatch(url))
        {
            // ZipCode must be of 6 digit only.
           return "ZipCode must be of 6 digit only.";
           
        }
        else
        {
            return "";
        }
    }
    public string Minimuntwochar(string name)
    {
        Regex objAlphaPattern = new Regex("^[A-Za-z]{2,}$");
        if (!objAlphaPattern.IsMatch(name))
        {
            // Minimum Two Characters.
            return "Minimum Two Characters.";
        
        }
        else
        {
            return "";
        }
    }
    public string Isnullorempty(String Controlname,string name)
    {
        if (string.IsNullOrEmpty(name))
        {
            return "Please Enter " + Controlname;
        }
        else
        {
            return "";
        }
    }
    public string Compare(string controlname,string first,string second)
    {
        //Compare two field
        if (!string.IsNullOrEmpty(first))
        {
            if (first == second)
            {
                return controlname + " accepted";
            }
            else
            {
                return controlname + " do not match.";
            }
        }
        else
        {
            return controlname + " Cannot be Empty!.";
        }
    }
    public string Isnumeric(string numeric)
    {
        Regex objnumeric = new Regex("^\\d+$");
        if (!objnumeric.IsMatch(numeric))
        {
            // Minimum Two Characters.
            return "Numeric Character only.";

        }
        else
        {
            return "";
        }

    }
    public string Maxlength(string controlname,int maxlength, string controlvalue)
    {
        if (!String.IsNullOrEmpty(controlvalue))
        {
            if (controlvalue.Length!= maxlength)
            {
                return controlname + " Should not exceed the " + maxlength + " Character";
            }
            else
            {
                return "";
            }

        }
        return "Please Enter " + controlname; ;

    }

}



 Control and label

<asp:TextBox ID="txtzipcode" runat="server"></asp:TextBox><asp:Label ID="lblzip"
                        runat="server"></asp:Label>

How  To Use On Page





 validate formvalidation = new validate();
        lblzip.Text = formvalidation.IsZipCodeValid(txtzipcode.Text);