I am using a gridview in tab container but it showing me an error that "TabContainer cannot have children of type 'System.Web.UI.WebControls.GridView".

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Gridview

I am using a gridview in tab container but it showing me an error that

"TabContainer cannot have children of type 'System.Web.UI.WebControls.GridView".

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    
       <asp:TabContainer ID="TabContainer1" runat="server">
       <asp:TabPanel>
       <HeaderTemplate>List Of Clients</HeaderTemplate>
       <contenttemplate>
           <asp:GridView ID="GridView1" runat="server">
           
       </contenttemplate>

Above is my sample code.plz help me.

code blocks and question from title