Bind DropDownList in GridView

<ItemTemplate>

<%#Eval("Deptno") %>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="EmpName">

<ItemTemplate>

<asp:DropDownList ID="ddl" runat="server">

<asp:ListItem>--Select--</asp:ListItem>

</asp:DropDownList>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>
Default.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
BindGrid();
}

private void BindGrid()
{
SqlConnection con = new SqlConnection("");
SqlDataAdapter da = new SqlDataAdapter("select * from emp", con);
da.Fill(ds, "Emp");
GridView1.DataSource = ds;
GridView1.DataBind();
foreach (GridViewRow grdRow in GridView1.Rows)
{
DropDownList drdList = new DropDownList();
// Nested DropDownList Control reference is passed to the DrdList object. This will allow you access the properties of dropdownlist placed inside the GridView Template column.
drdList = (DropDownList)( GridView1.Rows[ grdRow.RowIndex ].Cells[4].FindControl( "ddl" ));
// DataBinding of nested DropDownList Control for each row of GridView Control.
drdList.DataSource = ds;
drdList.DataValueField = "Sno";
drdList.DataTextField = "Name";
drdList.DataBind();
}
}