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[Solved] ComboBox SelectedIndex always -1 or 0

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Tim asked on 26 Jun 2010, 09:14 PM

I've got two comboboxes with two objectdatasources:

    
            <telerik:RadComboBox ID="RadComboBoxConnection" runat="server" Height="200px" Width="300px" 
        
                    Filter="Contains" MarkFirstMatch="true" ChangeTextOnKeyBoardNavigation="false" AllowCustomText="false" 
        
                    DataSourceID="ObjectDataSourceConnection" DataTextField="DatabaseFriendlyName" DataValueField="ImportConnectionId" AutoPostBack="true" EnableViewState="true"> 
        
            </telerik:RadComboBox> 
        
            <telerik:RadComboBox ID="RadComboBoxObject" runat="server" Height="200px" Width="300px" 
        
                    Filter="Contains" MarkFirstMatch="true" ChangeTextOnKeyBoardNavigation="false" AllowCustomText="false" 
        
                    DataSourceID="ObjectDataSourceObject" DataTextField="ObjectName" DataValueField="ImportObjectId" AutoPostBack="true" EnableViewState="true" OnSelectedIndexChanged="RadComboBoxObject_OnSelectedIndexChanged"> 
        
            </telerik:RadComboBox> 
        
            <asp:Literal ID="litMessage" runat="server" /> 
        
            <asp:ObjectDataSource ID="ObjectDataSourceConnection" runat="server"  
        
                TypeName="Ams.Web.BackOffice.ImportConnectionAdapter"  
        
                DataObjectTypeName="Ams.Core.DomainObject.ImportConnection"  
        
                OldValuesParameterFormatString="original_{0}" 
        
                ConflictDetection="CompareAllValues" 
        
                SelectMethod="SelectImportConnection" /> 
        
            <asp:ObjectDataSource ID="ObjectDataSourceObject" runat="server"  
        
                TypeName="Ams.Web.BackOffice.ImportObjectAdapter"  
        
                DataObjectTypeName="Ams.Core.DomainObject.ImportObject"  
        
                OldValuesParameterFormatString="original_{0}" 
        
                ConflictDetection="CompareAllValues" 
        
                SelectMethod="SelectImportObject"> 
        
                    <SELECTPARAMETERS> 
        
                        <asp:ControlParameter Name="aImportConnectionId" PropertyName="SelectedValue" ControlID="RadComboBoxConnection" /> 
        
                    </SELECTPARAMETERS> 
        
                </asp:ObjectDataSource>

The first combobox I have no problems with. I can selected any entry, and on postback it retains its values.
The second combobox however, when selecting a new item, it loses its value every time. Page_Init its SelectedIndex is -1. Page_Load, always 0!! Even when declaring OnSelectedIndexChanged, still 0. ALWAYS 0 or -1!
Any ideas? Thanks in advance.
PS. Also found something really quirky. I can select an entry, then if I deselect (lose the focus of the second combobox) it reverts to the SelectedIndex = 0.

[Solved] ComboBox SelectedIndex always -1 or 0

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