ASP DropdownListBox Default not working

[seanwalsh]

Hi

I have a DDLB in a gridview that allows record entry. The default is set by the QueryString. Here is the code:

                <FooterTemplate>
                    <asp:DropDownList ID="MenuInsert" runat="server" OnDataBound="test">
                        <asp:ListItem Text="" Value=""></asp:ListItem>
                        <asp:ListItem Text="Top Menu" Value="Top Menu" Selected="<%if(1==1){Response.Write('True')}else{Response.Write('False')};%>"></asp:ListItem>
                        <asp:ListItem Text="Side Menu" Value="Side Menu" Selected="<%if(1==2){Response.Write('True')}else{Response.Write('False')};%>"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:RequiredFieldValidator ID="valMenuInsert" runat="server" Display="Dynamic" ControlToValidate="MenuInsert" ErrorMessage="NB!" ValidationGroup="valInsert"></asp:RequiredFieldValidator>
                </FooterTemplate>

This gives me the error:
System.Web.Http Exception: Cannot have multiple items selected in a DropDownList.

Previously, I had tried:

    protected void Page_Load(object sender, EventArgs e)
    {
        DropDownList MenuInsert = MyGridView.FooterRow.FindControl("MenuInsert") as DropDownList;
        MenuInsert.SelectedValue = Server.UrlDecode(Request.QueryString["Menu"]);
    }

That sort of worked. On a fresh load, it set the default. But after editing/deleting/inserting a record in the grid, ie. after postback, then it remained blank, wasn't set.

any help why/how?

[nateraaaa]

Hi

I have a DDLB in a gridview that allows record entry. The default is set by the QueryString. Here is the code:

 <FooterTemplate>
<asp:DropDownList ID="MenuInsert" runat="server" OnDataBound="test">
<asp:ListItem Text="" Value=""></asp:ListItem>
<asp:ListItem Text="Top Menu" Value="Top Menu" Selected="<%if(1==1){Response.Write('True')}else{Response.Write('False')};%>"></asp:ListItem>
<asp:ListItem Text="Side Menu" Value="Side Menu" Selected="<%if(1==2){Response.Write('True')}else{Response.Write('False')};%>"></asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="valMenuInsert" runat="server" Display="Dynamic" ControlToValidate="MenuInsert" ErrorMessage="NB!" ValidationGroup="valInsert"></asp:RequiredFieldValidator>
</FooterTemplate>

This gives me the error:
System.Web.Http Exception: Cannot have multiple items selected in a DropDownList.

Previously, I had tried:

 protected void Page_Load(object sender, EventArgs e)
{
DropDownList MenuInsert = MyGridView.FooterRow.FindControl("MenuInsert") as DropDownList;
MenuInsert.SelectedValue = Server.UrlDecode(Request.QueryString["Menu"]);
}

That sort of worked. On a fresh load, it set the default. But after editing/deleting/inserting a record in the grid, ie. after postback, then it remained blank, wasn't set.

any help why/how?

In your page_load event use the code you already tried but put that code inside of a !IsPostBack conditional statement.

 protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
DropDownList MenuInsert = MyGridView.FooterRow.FindControl("MenuInsert") as DropDownList;
MenuInsert.SelectedValue = Server.UrlDecode(Request.QueryString["Menu"]);
}
}

Nathan