asp.net - Grid Update Event not working -

error on :: rowindex not found

gridviewrow row = (gridviewrow)gridview1.rows[e.rowindex]; 

below grid row update event....

  protected void gridview1_rowupdating(object sender, eventargs e)     {              gridviewrow row = (gridviewrow)gridview1.rows[e.rowindex];     dropdownlist ct = (dropdownlist)row.findcontrol("case_type");     dropdownlist cs = (dropdownlist)row.findcontrol("case_status");      con.open();     sqlcommand cmd = new sqlcommand("update intakesheet set case_number = @case_number, case_name=@case_name, case_type=@case_type, case_status = @case_status, assigned_date = @assigned_date, assigned_to = @assigned_to, date_withdrawn= @date_withdrawn, date_delivered= @date_delivered, qc_by = @qc_by,  qc_date=@qc_date, additional_notes = @additional_notes (case_number = @case_number)", con);     cmd.executenonquery();     gridview1.editindex = -1;     con.close();     bind();  }  public void bind() {      con.open();     sqldataadapter da = new sqldataadapter("select * intakesheet", con);     dataset ds = new dataset();     da.fill(ds, "intakesheet");     gridview1.datasource = ds.tables[0].defaultview;     gridview1.databind();     con.close();  } 

change line

 protected void gridview1_rowupdating(object sender, eventargs e) 

with

protected void gridview1_rowupdating(object sender, gridviewupdateeventargs e)