Question

Here is my code where it’s giving the value of ddl = null:

//event handler to bind the data to the row before rendering the gridview
protected void gridview1_RowDataBound(object sender ,GridViewRowEventArgs e)
{
    if ((e.Row.RowType == DataControlRowType.DataRow)&&(e.Row.DataItem!=null))
    {
        //DropDownList ddlNo = (DropDownList)e.Row.FindControl("ddlNo");
        DropDownList ddlNo = (DropDownList)e.Row.FindControl("ddlNo");

        if (ddlNo != null)
        {
            ddlNo.DataSource = Test.GetData();
            ddlNo.DataBind();
            ddlNo.SelectedValue = gridview1.DataKeys[e.Row.RowIndex].Values[0].ToString();//datakeys are used to retain the value of the no. in edit mode    
        }
    }
}

Here is my aspx code:

<asp:GridView ID="gridview1" runat="server" AutoGenerateColumns="false" AutoGenerateDeleteButton="false" AutoGenerateEditButton="false" ShowFooter="true" EmptyDataText="No data available." PagerStyle-HorizontalAlign="Right" AllowPaging="true" AllowSorting="true" GridLines="Vertical" Width="98%" EnableViewState="true" OnRowCancelingEdit="gridview1_RowCancelingEdit" OnRowDataBound="gridview1_RowDataBound" OnRowEditing="gridview1_RowEditing" OnRowUpdating="gridview1_RowUpdating" OnRowCommand="gridview1_RowCommand" OnRowDeleting="gridview1_RowDeleting" DataKeyNames="testID">
    <Columns>
        <asp:TemplateField HeaderText="Select" HeaderStyle-HorizontalAlign="Left">
            <ItemTemplate>
                <asp:Label ID="lblSelect" runat="server" Text="Select"></asp:Label>
                <%-- <asp:CheckBox ID="chkSelect" runat="server" AutoPostBack="true" OnCheckedChanged="chkSelect_CheckChanged" />--%>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" />
        </asp:TemplateField>
        <asp:BoundField DataField="testID" HeaderText="SearchId" />
        <asp:TemplateField HeaderText="Name" HeaderStyle-HorizontalAlign="Left">
            <EditItemTemplate>
                <asp:TextBox ID="txtName" runat="server" Text='<%#Eval("testDesc") %>' />
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtNewName" runat="server"></asp:TextBox>
            </FooterTemplate>
            <ItemTemplate>
                <asp:Label ID="lblName" runat="server" Text='<%# Bind("testDesc") %>'></asp:Label>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="No." HeaderStyle-HorizontalAlign="Left">
            <EditItemTemplate>
                <asp:DropDownList ID="ddlNo" runat="server" DataTextField="testNo" DataValueField="testNo" />
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="lblNo" runat="server" Text='<%# Bind("testNo") %>'></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:DropDownList ID="ddlNewNo" runat="server" DataTextField="testNo" DataValueField="testNo">
                </asp:DropDownList>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Edit" ShowHeader="False">
            <EditItemTemplate>
                <asp:LinkButton ID="linkbt1" runat="server" CausesValidation="true" CommandName="Update" Text="Update">
                </asp:LinkButton>
                <asp:LinkButton ID="linkbt2" runat="server" CausesValidation="false" CommandName="Cancel" Text="Cancel"></asp:LinkButton>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:LinkButton ID="linkbt1" runat="server" CausesValidation="false" CommandName="Edit" Text="Edit">

                </asp:LinkButton>
            </ItemTemplate>
            <FooterTemplate>
                <asp:LinkButton ID="linkbt2" runat="server" CausesValidation="false" CommandName="AddNew" Text="AddNew">

                </asp:LinkButton>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:CommandField HeaderText="Delete" ShowDeleteButton="true" ShowHeader="true" />
    </Columns>
</asp:GridView>

Can anyone provide a relevant solution to this?

Answer 1

you put the ddl no in the footer template but you’re only checking for that in the (e.Row.RowType == DataControlRowType.DataRow) Change that to FooterRow and it should find it

change the above line to

if(e.Row.RowType == DataControlRowType.Footer && e.Row.DataItem != null)