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copied!<p>It looks like the method <code>GetVehicles()</code> is dynamically creating the drop-down list, since you are adding the drop-down to Controls collection on the last line of second if statement.</p> <p>When you are dynamically creating controls, you have to recreate them on every postback. </p> <p>Instead, place the drop-down control inside <code>EditItemTemplate</code> and then find this control using the <code>FindControl</code> method and populate it in code behind like you are doing now.</p> <p>Here is the example of GridView definition:</p> <pre><code><asp:GridView runat="server" ID="GridViewVehicles" OnRowDataBound="GridViewVehicles_RowDataBound" OnRowUpdating="GridViewVehicles_RowUpdating"> <Columns> <asp:TemplateField> <ItemTemplate>  </ItemTemplate> <EditItemTemplate> <asp:DropDownList runat="server" ID="ddlVehicles" /> </EditItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </code></pre> <p>And the code-behind:</p> <pre><code>protected void GridViewVehicles_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow && e.Row.RowState == DataControlRowState.Edit) { //Get the drop-down datasource and perform databinding } } protected void GridViewVehicles_RowUpdating(object sender, GridViewUpdateEventArgs e) { DropDownList ddlVehicles = GridViewVehicles.Rows[e.RowIndex].FindControl("ddlVehicles") as DropDownList; if (ddlVehicles != null) { string selectedValue = ddlVehicles.SelectedValue; } } </code></pre> <p>Hope it helps!</p> <p>Regards,</p> <p>Uroš</p>

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