c# - Updating values in gridview is not working -


there row in gridview in there column name poa_no value 899.

but deleting value , updating blank. still getting updated 899 only.

here code

protected void grddetail_updatecommand(object sender, gridrecordeventargs e) {     if (session["viewinfo"] != null)     {         dtviewinfo = (datatable)session["viewinfo"];     }     else     {         return;     }      datarow[] drviewinfo = dtviewinfo.select("sr_no = " + e.record["sr_no"]);      if (e.record["type"] != "")     {         drviewinfo[0]["type"] = e.record["type"];     }     else     {         drviewinfo[0]["type"] = "null";     }      if (e.record["ref_no"] != "")     {         drviewinfo[0]["ref_no"] = e.record["ref_no"];     }     if (e.record["ref_date"] != "")     {         drviewinfo[0]["ref_date"] = e.record["ref_date"];     }     if (e.record["poa_no"] != "")     {         drviewinfo[0]["poa_no"] = e.record["poa_no"];     }     if (e.record["poa_date"] != "")     {         drviewinfo[0]["poa_date"] = e.record["poa_date"];     }     if (e.record["poa_name"] != "")     {         drviewinfo[0]["poa_name"] = e.record["poa_name"];     }      if (e.record["attachment"] != "")     {         drviewinfo[0]["attachment"] = e.record["attachment"];     }      grddetail.datasource = dtviewinfo;     grddetail.databind();     addtoviewstate("gridviewinfo"); }

edit

page load code

dtviewinfo = cf.executedt("select sr_no, type, ref_no, to_char (ref_date,'dd/mm/yyyy') ref_date, poa_no , to_char (poa_date, 'dd/mm/yyyy')   poa_date, poa_name, attachment xxcus.xxacl_pn_view_data_info " +                               "where mkey = '" + strmkey + "' order   sr_no");       grddetail.datasource = dtviewinfo;     grddetail.databind();     addtoviewstate("gridviewinfo");


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