Question

I am using VS2005 C#.

Currently I have a GridView, and I have changed one of my GridView control to my column name Gender, from the default TextBox to a DropDownList, which I gave the ID of the control to GenderList, and it contains 2 values, M and F.

I have a default update statement which is able to update the GridView after edit, which is the following:

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString=
"<%$ ConnectionStrings:SODConnectionString %>" UpdateCommand="UPDATE 
[UserMasterData] SET [Name] = @Name, [Age] = @Age, [ContactNo]=@ContactNo,
 [Address]=@Address, [Gender]=@Gender"/>

The above UPDATE query works perfectly, and now I have changed my Gender textbox to a dropdownlist, the UPDATE query gave me an error which says:

Must declare the scalar variable "@Gender".

I assume the UPDATE query couldn’t find the value from my Gender column.

I tried to modify the UPDATE query to @GenderList, but it did not work as well.

Anyone knows what I should do do the UPDATE query so that my UPDATE query can find the value from my GenderList dropdownlist in my Gender column?

Thank you.

---

Below is my previous Gender column with a textbox control:

                <asp:BoundField  HeaderText="Gender" 
                DataField="Gender" 
                SortExpression="Gender"></asp:BoundField>

Below is my Gender with the dropdownlist control:

    <asp:TemplateField HeaderText="Gender" SortExpression="Gender" >
        <EditItemTemplate>
            <asp:DropDownList ID="GenderList" runat="server" Width="50px" >
                <asp:ListItem>M</asp:ListItem>
                <asp:ListItem>F</asp:ListItem>
            </asp:DropDownList>
        </EditItemTemplate>
        <ItemTemplate>

---

EDIT:

Tried implementing RowDatBound and onRowUpdating:

---

RowDatBound

---

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    DataRowView dRowView = (DataRowView)e.Row.DataItem;
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if ((e.Row.RowState & DataControlRowState.Edit) > 0)
        {
            DropDownList genderList= (DropDownList)e.Row.FindControl("GenderList");
            genderList.SelectedValue = dRowView[2].ToString();
        }
    }
}

---

RowUpdating.aspx.cs

---

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{

DropDownList genderSelect =(DropDownList)GridView1.Rows[e.RowIndex].FindControl("GenderList");

SqlDataSource1.UpdateParameters["Gender"].DefaultValue = 
genderSelect.SelectedValue; --> error says not set to an instance of an object

}

Answer 1

If you are using SqlDataSource and updating data via it then all you have to do is to set 2 way binding for the dropdownlist GenderList.

You can set this via the designer or directly in source also

 <EditItemTemplate>
                <asp:DropDownList ID="GenderList" runat="server" 
                    SelectedValue='<%# Bind("Gender") %>'>
                    <asp:ListItem>M</asp:ListItem>
                    <asp:ListItem>F</asp:ListItem>
                </asp:DropDownList>
            </EditItemTemplate>

notice that here 2 way binding is being used.