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Want to update data dynamically using entity framework in C#

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Hlo Professionals!

Here is my code

<div> protected void BT_update_Click(object sender, EventArgs e)</div> <div>        {</div> <div>           </div> <div>            int status = 0;</div> <div>          </div> <div>           using  (SchoolEntities2 ctx = new SchoolEntities2())</div> <div>            {</div> <div> </div> <div>               </div> <div> </div> <div>                {</div> <div> </div><div>                    var on = ctx.packages.Where(a => a.tbl_id == 1).FirstOrDefault();</div> <div>                    </div> <div>                    on.package_name = tb_name.Text;</div> <div>                   on.reward = dd3.SelectedValue.ToString();</div> <div>                    on.remarks = tb_remarks.Text;</div> <div>                    on.by_whom = Session["username"].ToString();</div> <div>                    on.date_time = System.DateTime.Now.ToLocalTime();</div> <div> </div> <div>                }</div> <div> </div> <div> </div> <div>                status = ctx.SaveChanges();</div> <div>               Fillgridview();</div> <div>            }</div> <div> </div> <div>        }</div>

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