Access dropdownlist inside the gridview

Hi Friends,

Many times we came cross the requirement when we need to access the dropdownlist's selectedindexchanged event inside the gridview, like in a shopping cart changing the item's quantity or binding the other dropdown based on the first dropdown.

In such a case we just need to access the controls that has fired the event and this can be done just by using this line

  GridViewRow gr = (GridViewRow)((DataControlFieldCell)((DropDownList)sender).Parent).Parent;

I have written an example too for the same reuirement, and you may check it below.

  <asp:GridView ID="GV" runat="server" AutoGenerateColumns="false" OnDataBound="GV_DataBound"
                    OnRowDataBound="GV_RowDataBound">
                    <Columns>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:Label ID="lblId" runat="server" Text='<%#Eval("id") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:Label ID="lblName" runat="server" Text='<%#Eval("Name") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:Label ID="lblPrice" runat="server" Text='<%#Eval("price") %>'></asp:Label>
                                <asp:Label ID="lblOriginalPrice" runat="server" Text='<%#Eval("price") %>' Visible="false"></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:DropDownList ID="ddlQty" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlQty_SelectedIndexChanged">
                                    <asp:ListItem Text="1" Value="1"></asp:ListItem>
                                    <asp:ListItem Text="2" Value="2"></asp:ListItem>
                                    <asp:ListItem Text="3" Value="3"></asp:ListItem>
                                    <asp:ListItem Text="4" Value="4"></asp:ListItem>
                                    <asp:ListItem Text="5" Value="5"></asp:ListItem>
                                    <asp:ListItem Text="6" Value="6"></asp:ListItem>
                                    <asp:ListItem Text="7" Value="7"></asp:ListItem>
                                    <asp:ListItem Text="8" Value="8"></asp:ListItem>
                                </asp:DropDownList>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>

protected void ddlQty_SelectedIndexChanged(object sender, EventArgs e)
    {
        GridViewRow gr = (GridViewRow)((DataControlFieldCell)((DropDownList)sender).Parent).Parent;
        DropDownList ddlQty = (DropDownList)gr.FindControl("ddlQty");
        if (ddlQty != null)
        {
            
                Label lblPrice = (Label)gr.FindControl("lblPrice");
                Label lblOriginalPrice = (Label)gr.FindControl("lblOriginalPrice");
                int price = Convert.ToInt32(lblOriginalPrice.Text);
                int NewPrice = price * Convert.ToInt16(ddlQty.SelectedValue);
                lblPrice.Text = Convert.ToString(NewPrice);  
          
        }
    }

Happy Coding........:)