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

public partial class user_inbox : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       
    }
    protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
    {
        
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            var chk = GridView1.Rows[i].Cells[0].FindControl("chksender") as CheckBox;
            chk.Checked = chkheader.Checked;
        }
        
    }

    protected void chksender_CheckedChanged(object sender, EventArgs e)
    {
        bool flag = true;
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            
            var chk = GridView1.Rows[i].Cells[0].FindControl("chksender") as CheckBox;
            if (chk.Checked == false)
            {
                flag = false;
                break;
            }

        }
        chkheader.Checked = false;
    }
    
}