this is aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;


public partial class phoneLostData : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)
{

    Button b1 = sender as Button;

    try
    {
        string dbAddress = @"Data Source=.SQLEXPRESS;AttachDbFilename=D:mcasem5sem5ProjectApp_DataDatabase.mdf;Integrated Security=True;User Instance=True; MultipleActiveResultSets=True;";

        SqlConnection myCon = new SqlConnection(dbAddress);
        myCon.Open();

        string q1 = "select complainerName,status from lostPhnFir";

        SqlCommand myCmd = new SqlCommand(q1, myCon);

        SqlDataReader readIt = myCmd.ExecuteReader();



             while (readIt.Read())
             {
                // Response.Write("alert('hi')");
                 if (readIt["complainerName"].Equals("abc") && readIt["status"].Equals("Checked"))
                 {
                     b1.Text = "Checked";

                     b1.Enabled = false;

                 }
             }

        readIt.Close();

        myCon.Close();


    }
    catch (Exception ex)
    {
        Response.Write(ex.Message);
    }



}



 public void Button1(object sender, EventArgs e)
 {
    Button b1 = sender as Button;  // I want to use this b1 to page_load

    string dbAddress = @"Data Source=.SQLEXPRESS;AttachDbFilename=D:mcasem5sem5ProjectApp_DataDatabase.mdf;Integrated Security=True;User Instance=True; MultipleActiveResultSets=True;";

    SqlConnection myCon = new SqlConnection(dbAddress);
    myCon.Open();

    string q1 = "select complainerName from lostPhnFir";
    int flag = 0;
    SqlCommand myCmd = new SqlCommand(q1, myCon);

    SqlDataReader readIt = myCmd.ExecuteReader();

    if (b1.ID == "btnFIRLodge")
    {
        b1.Text = "Checked";
        b1.Enabled = false;
        flag = 1;
    }

    if (flag == 1)
    {
        string status1 = "Checked";
        string s1 = "abc";
        string sql = "update lostPhnFir set status='" + status1 + "' where complainerName='" + s1 + "'";
        SqlCommand myCmd2 = new SqlCommand(sql, myCon);
        myCmd2.ExecuteNonQuery();
    }
}

//this is aspx.

<asp:TemplateField HeaderText="FIR Lodged" ShowHeader="False">
         <ItemTemplate>
             <asp:Button ID="btnFIRLodge" runat="server"
                Text="Send Message" onclick="Button1"></asp:Button>
         </ItemTemplate>
</asp:TemplateField>