How To Update A Column In A DataGrid Using C#.NET?
I am getting InvalidCastException as (Specified cast is not
valid) while updating 2nd column in a datagrid?
Id,firstname,lastname are the three columns of my datagrid
respectively. I wanted to edit the second column(lastname)
and update it. I did the following code in DataGrid's
updatecommand(),but failed to update !
Int varid=(int)DataGrid1.DataKeys[e.Item.ItemIndex];
TextBox lnm=(TextBox)e.Item.Cells[2].Controls[0]; string
str=lnm.Text ; SqlCommand cmd=new SqlCommand("update
customer set lastname='" + str + "' where id=" + varid
+ "",con); cmd.ExecuteNonQuery(); DataGrid1.EditItemIndex=-
1; DataGrid1.DataBind();
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Answer Posted / pk
public void DataGrid1_Update(Object sender,
DataGridCommandEventArgs e)
{
string unitprice =
((TextBox)e.Item.Cells[3].Controls[0]).Text;
string quantity =
((TextBox)e.Item.Cells[4].Controls[0]).Text;
string discount =
((TextBox)e.Item.Cells[5].Controls[0]).Text;
int orderid =
(int)DataGrid1.DataKeys[(int)e.Item.ItemIndex];
string productid =
((TextBox)e.Item.Cells[2].Controls[0]).Text;
try
{
string updateCmd = "UPDATE [Order Details] SET
UnitPrice = @UnitPrice,"
+ "Quantity = @Quantity, Discount = @Discount
where OrderId =@OrderId and ProductId=@ProductId";
SqlConnection cn = new SqlConnection(strConn);
SqlCommand myCommand = new SqlCommand(updateCmd,
cn);
myCommand.Parameters.Add(new
SqlParameter("@UnitPrice", Convert.ToDecimal(unitprice)));
myCommand.Parameters.Add(new
SqlParameter("@Quantity", Convert.ToInt16(quantity)));
myCommand.Parameters.Add(new
SqlParameter("@Discount", Convert.ToInt16(discount)));
myCommand.Parameters.Add(new
SqlParameter("@OrderId", orderid));
myCommand.Parameters.Add(new
SqlParameter("@ProductId", Convert.ToInt16(productid)));
cn.Open();
myCommand.ExecuteNonQuery();
DataGrid1.EditItemIndex = -1;
BindGrid();
}
catch (Exception ex)
{
lblError.Visible = true;
lblError.Text = (ex.Message);
}
| Is This Answer Correct ? | 2 Yes | 5 No |
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