I am having problems with asp.net binding to a dropdownlist and I have no clue on how to debug. I checked out the other questions about this on stack but nothing has helped. As far as I can see the "name" it should select is in the list. 

```
<asp:DropDownList ID="dd1" runat="server" DataSourceID="ADataSource" DataTextField="Name" 
                                                    DataValueField="Name" SelectedValue='<%# Bind("Name") %>'   Width="255" 
                                                    AppendDataBoundItems="true" TabIndex="3"  Font-Size="small"  EnableViewState="true"    >
                                             <asp:ListItem Text="Select"  Value="" />
                                           </asp:DropDownList>

```

Following is the error

> 
> System.ArgumentOutOfRangeException was unhandled by user code
>  Message='dd1' has a SelectedValue which is invalid because it does not exist in the list of items.
>  Parameter name: value
>  Source=System.Web
>  ParamName=value
>  StackTrace:
>  at System.Web.UI.WebControls.ListControl.PerformDataBinding(IEnumerable
>  dataSource)
>  at System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e)
>  at System.Web.UI.WebControls.ListControl.PerformSelect()
>  at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()
>  at System.Web.UI.Control.DataBindChildren()
>  at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
>  at System.Web.UI.Control.DataBind()
>  at System.Web.UI.Control.DataBindChildren()
>  at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
>  at System.Web.UI.Control.DataBind()
>  at System.Web.UI.Control.DataBindChildren()
>  at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
>  at System.Web.UI.Control.DataBind()
>  at System.Web.UI.Control.DataBindChildren()
>  at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
>  at System.Web.UI.WebControls.DetailsView.CreateChildControls(IEnumerable
>  dataSource, Boolean dataBinding)
>  at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable
>  data)
>  at System.Web.UI.WebControls.DetailsView.PerformDataBinding(IEnumerable
>  data)
>  at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable
>  data)
>  at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments
>  arguments, DataSourceViewSelectCallback callback)
>  at System.Web.UI.WebControls.DataBoundControl.PerformSelect()
>  at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()
>  at System.Web.UI.WebControls.DetailsView.DataBind()
>  at storeUpdate.GvStoresSelect\_SelectedIndexChanged(Object sender, EventArgs e) in line 233
>  at System.EventHandler.Invoke(Object sender, EventArgs e)
>  at System.Web.UI.WebControls.GridView.OnSelectedIndexChanged(EventArgs e)
>  at System.Web.UI.WebControls.GridView.HandleSelect(Int32 rowIndex)
>  at System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup)
>  at System.Web.UI.WebControls.GridView.OnBubbleEvent(Object source, EventArgs e)
>  at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
>  at System.Web.UI.WebControls.GridViewRow.OnBubbleEvent(Object source,
>  EventArgs e)
>  at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
>  at System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e)
>  at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String
>  eventArgument)
>  at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
>  eventArgument)
>  at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
>  sourceControl, String eventArgument)
>  at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
>  at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
>  InnerException:
> 
> 
>