I want bind data to dropdownlist in edittamplate in grid view

protected void ddl1_Load(object sender, EventArgs e)
{
DropDownList ddl=(DropDownList)sender;
ddl.DataSource = (...call yur values here...)
ddl.DataValueField = "Column name ";
ddl.DataBind();
}


<asp:DropDownList ID="ddlOrderType" runat="server" Onload="ddl1_load()">

</asp:DropDownList>