Gridview paging :The data source does not support server-side data paging

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C#

ASP.NET

Hi ,if I put AllowPaging="False" this works but I need paging on my project,when I put AllowPaging="True" it doesnt work !
and error is "The data source does not support server-side data paging"
Can any body help me ? I am new in coding
thanks

<asp:GridView ID="GridView6" runat="server" BackColor="White"
BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4"
ForeColor="Black" GridLines="Vertical" Width="507px" PageSize="3"
AllowPaging="True" onpageindexchanging="GridView6_PageIndexChanging">
<alternatingrowstyle backcolor="White">
<columns> <asp:TemplateField >
<itemtemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />


<footerstyle backcolor="#CCCC99">
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
<pagerstyle backcolor="#F7F7DE" forecolor="Black" horizontalalign="Right">
Font-Bold="True" />
<rowstyle backcolor="#F7F7DE">
<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<sortedascendingcellstyle backcolor="#FBFBF2">
<sortedascendingheaderstyle backcolor="#848384">
<sorteddescendingcellstyle backcolor="#EAEAD3">
<sorteddescendingheaderstyle backcolor="#575357">



code behind:


SqlCommand cmd = new SqlCommand(" ", con);
SqlDataReader dr1;
con.Open();
cmd.CommandText = "my select quary"
dr1 = cmd.ExecuteReader();
if (dr1.HasRows == true)
{
con.Close();
GridView6.DataSource = dr1;
GridView6.DataBind();
}
con.Close();