June 29, 2021

Programmingempire

The following example demonstrates how to Edit a Record Using DataGrid Control in ASP.NET. Before proceeding further, you can go through these examples on DataGrid control that I have posted earlier.

Meanwhile, we use a TemplateColumn as before to display the templates. Further, each TemplateColumn contains an EditItemTemplate along with an ItemTemplate. While the ItemTemplate displays the values of the field, the EditItemTemplate shows the corresponding layout when the user clicks on the Edit button.

Further, the DataGrid contains one more type of column in its layout – EditCommandColumn. As can be seen in the following code, this particular column is included in the DataGrid as the last column. Significantly, this column displays an Edit button in front of each row. Therefore now it is possible to edit an individual record.

In order to support the Edit operation, the EditCommandColumn displays the Update and Cancel buttons when the user clicks on the Edit button. Hence, a user can update an individual record. Also, if the user clicks on the Cancel button, the Edit layout disappears and the layout generated by the ItemTemplate is shown. That is possible because we call the BindGrid() method in the CancelCommand event handler.

After creating the templates, we need to define the event handler methods for EditCommand, UpdateCommand, and CancelCommand.

Creating EditItemTemplate to Edit a Record Using DataGrid Control

<asp:DataGrid ID="DataGrid1" runat="server"
                 AutoGenerateColumns="false" DataKeyField="item_id" 
                OnCancelCommand="DataGrid1_CancelCommand" 
                OnEditCommand="DataGrid1_EditCommand" 
                OnUpdateCommand="DataGrid1_UpdateCommand"
                 BackColor="Lavender" Font-Bold="true" BorderColor="Navy"
                 BorderStyle="Outset" BorderWidth="4"
                  CellPadding="10" CellSpacing="10"
                 Font-Size="Large">
                <Columns>
                    <asp:TemplateColumn>
                        <HeaderStyle BackColor="LightBlue" ForeColor="Navy"/>
                        <HeaderTemplate>
                            Item ID
                        </HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label ID="Label1" runat="server"
                                Text='<%#DataBinder.Eval(Container,"DataItem.item_id") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:Label ID="Label5" runat="server"
                                Text='<%#DataBinder.Eval(Container,"DataItem.item_id") %>'></asp:Label>
                        </EditItemTemplate>
                    </asp:TemplateColumn>
                    <asp:TemplateColumn>
                        <HeaderStyle BackColor="LightBlue" ForeColor="Navy"/>
                        <HeaderTemplate>
                            Item Name
                        </HeaderTemplate>
                        <ItemTemplate>
                           <asp:Label ID="Label2" runat="server" 
                               Text='<%#DataBinder.Eval(Container,"DataItem.item_name") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:TextBox ID="t1" runat="server"
                                 Text='<%#DataBinder.Eval(Container,"DataItem.item_name") %>'></asp:TextBox>
                        </EditItemTemplate>
                    </asp:TemplateColumn>
                    <asp:TemplateColumn>
                        <HeaderStyle BackColor="LightBlue" ForeColor="Navy"/>
                        <HeaderTemplate>
                            Price
                        </HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label ID="Label3" runat="server" 
                                Text='<%#DataBinder.Eval(Container,"DataItem.price") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:TextBox ID="t2" runat="server"
                                 Text='<%#DataBinder.Eval(Container,"DataItem.price") %>'></asp:TextBox>
                        </EditItemTemplate>
                    </asp:TemplateColumn>
                    <asp:TemplateColumn>
                        <HeaderStyle BackColor="LightBlue" ForeColor="Navy"/>
                        <HeaderTemplate>
                            Quantity
                        </HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label ID="Label4" runat="server" 
                                Text='<%#DataBinder.Eval(Container,"DataItem.quantity") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                              <asp:TextBox ID="t3" runat="server"
                                   Text='<%#DataBinder.Eval(Container,"DataItem.quantity") %>'></asp:TextBox>
                        </EditItemTemplate>
                    </asp:TemplateColumn>
                    <asp:EditCommandColumn HeaderText="Edit" EditText="Edit"
                         CancelText="Cancel" UpdateText="Update">
                    </asp:EditCommandColumn>
                </Columns>
            </asp:DataGrid>

Events Required to Edit a Record Using DataGrid Control

The following code shows how we perform edit, update, and cancel operations with DataGrid control.

In this case, we use three event handlers. Firstly, an event handler in response to the EditCommand event. Particularly, it will set the EditItemIndex property to the index of the record for which the Edit button is clicked.

Secondly, the event handler for UpdateCommand executes the update query. At first, we retrieve the key using the DataKeys collection of the DataGrid. After that, we retrieve the values that the user has entered in the individual TextBoxes using the FindControl() method.

Now that, we have all the four parameters to formulate the update query. Basically, it is a parameterized query. Hence, the UpdateCommand event handler performs the actual update operation.

Finally, the CancelCommand event handler sets the EditItemIndex property to -1. Therefore, it cancels the Edit operation.

        protected void DataGrid1_EditCommand(object source, DataGridCommandEventArgs e)
        {
            DataGrid1.EditItemIndex = e.Item.ItemIndex;
            BindGrid();
        }

        protected void DataGrid1_UpdateCommand(object source, DataGridCommandEventArgs e)
        {
            int k = (int)DataGrid1.DataKeys[e.Item.ItemIndex];
            TextBox tx, ty, tz;
            tx = (TextBox)e.Item.FindControl("t1");
            ty = (TextBox)e.Item.FindControl("t2");
            tz = (TextBox)e.Item.FindControl("t3");

            String s1 = tx.Text.Trim();
            int a = Int32.Parse(ty.Text);
            int b = Int32.Parse(tz.Text);

            String str = "update Items set item_name=@in, price=@pr, quantity=@qu where item_id=@iid";
            Connect();
            SqlCommand cmd = new SqlCommand(str, c1);
            cmd.Parameters.AddWithValue("@iid", k);
            cmd.Parameters.AddWithValue("@in", s1);
            cmd.Parameters.AddWithValue("@pr", a);
            cmd.Parameters.AddWithValue("@qu", b);
            int n = cmd.ExecuteNonQuery();
            if (n > 0)
            {
                Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "updated", "<script>alert('Record Updated Successfully')</script>");
                DataGrid1.EditItemIndex = -1;
                c1.Close();
                BindGrid();
            }
            else
            {
                Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "updated", "<script>alert('Record Not Updated')</script>");
                DataGrid1.EditItemIndex = -1;
                c1.Close();
                BindGrid();
            }

        }
        protected void DataGrid1_CancelCommand(object source, DataGridCommandEventArgs e)
        {
            DataGrid1.EditItemIndex = -1;
            BindGrid();
        }

Output

**An Example to Edit a Record Using DataGrid Control in ASP.NET**

In the same way, we can perform delete operation using a DataGrid. The following link provides more information on deleting a record.

Deleting a Record using DataGrid Control in ASP.NET

Programmingempire

Creating EditItemTemplate to Edit a Record Using DataGrid Control

Events Required to Edit a Record Using DataGrid Control

Further Reading

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