C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;

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

    }
    protected void lbtnBasicSearch_Click(object sender, EventArgs e)
    {
        string sSearchText = GetBasicSearchString();
        OnSearch(sSearchText);

        lbtnCancelBasicSearch.Visible = true;
    }
    protected string GetBasicSearchString()
    {
        StringBuilder sb = new StringBuilder(string.Empty);
        string sBasicSearchText = txtBasicSearch.Text.Trim();

        if (sBasicSearchText == string.Empty)
            return string.Empty;

        string sFirstName = GetSearchFormattedFieldString("FirstName", sBasicSearchText, string.Empty, true);
        sb.Append(sFirstName);
        sb.Append(" OR ");

        string sLastName = GetSearchFormattedFieldString("LastName", sBasicSearchText, string.Empty, true);
        sb.Append(sLastName);
        sb.Append(" OR ");

        string sPinCode = GetSearchFormattedFieldString("PinCode", sBasicSearchText, string.Empty, true);
        sb.Append(sPinCode);
        sb.Append(" OR ");

        string sFilter = GetSearchFormattedFieldString("Filter", sBasicSearchText, string.Empty, true);
        sb.Append(sFilter);
        sb.Append(" OR ");



        string sSearch = sb.ToString();
        return sSearch;
    }
    protected string GetSearchFormattedFieldString(string sfield, string value, string soperator, bool bForceStringType)
    {
        if (value.Trim() == string.Empty)
            return string.Empty;

        string _newValue = value.Trim();
        

        string _operator = "=";
        if (soperator != string.Empty)
            _operator = soperator;

          if (bForceStringType == false)
        {
            
        }
        

        return _newValue;
    }
    public delegate void SearchEventHandler(string _SearchText);
    public event SearchEventHandler Search;
    protected virtual void OnSearch(string _SearchText)
    {
        if (Search != null)
        {
            Search(_SearchText);
        }
    }
    protected void lbtnCancelBasicSearch_Click(object sender, EventArgs e)
    {
        txtBasicSearch.Text = string.Empty;
        OnSearch(string.Empty);

        lbtnCancelBasicSearch.Visible = false;
    }
}

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="PinsSearch.ascx.cs" Inherits="Controls_PinsSearch" %>

<asp:Panel ID="pnlBasicSearch" runat="server" Width="100%">
    <table>
        
        <tr>
            <td>
                <asp:Label ID="lblBasicSearch" runat="server" Text="Search for:"  ></asp:Label>
            </td>
            <td>
                <asp:TextBox ID="txtBasicSearch" runat="server" Text="" MaxLength="50"  Width="255px" />
            </td>
            <td>
                <asp:LinkButton runat="server"  ID="lbtnBasicSearch" CausesValidation="False"  Text="Search" OnClick="lbtnBasicSearch_Click" />
            </td>
            <td>
                <asp:LinkButton runat="server"  ID="lbtnCancelBasicSearch"  CausesValidation="False" Visible="false" Text="Cancel" OnClick="lbtnCancelBasicSearch_Click" />
            </td>
        </tr>
        <tr>
            <td colspan="2" align="right">                
                
            </td>
            <td colspan="2"></td>
        </tr>
    </table>       
</asp:Panel>