In aspx i written like this<ext:ComboBox runat="server" ID="ComboBox1">
<Items>
<ext:ListItem Text="abc" Value="1" />
<ext:ListItem Text="xyz" Value="2" />
</Items>
</ext:ComboBox>

<ext:ComboBox runat="server" ID="ComboBox1">
<Items>
<ext:ListItem Value="1" />
<ext:ListItem Value="2" />
</Items>
</ext:ComboBox>












In aspx.cs
ComboBox1.SelectedIndex=ComboBox2.SelectedIndex









but it says read only plese help me













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