How to bind the data from dropdownlist of gridview control and how to retrieve the data from grid view .

<ItemTemplate>
 <asp:DropDownList ID="DropDownList1" DataTextField="Name"
   DataValueField = "Name" DataSource= '<%# PopulateControls() %>' runat="server">
 </asp:DropDownList>
</ItemTemplate>


public DataSet PopulateControls()
{
   SqlConnection myConnection = new SqlConnection(GetConnectionString());
   SqlDataAdapter ad = new SqlDataAdapter("SELECT [Name] FROM tblPerson",
                                                           myConnection);
   DataSet ds = new DataSet();
   ad.Fill(ds, "tblPerson");
   return ds;


}

foreach (GridViewRow row in GridView1.Rows)
   {
       // Selects the text from the TextBox

       // which is inside the GridView control

       string textBoxText = _
         ((TextBox)row.FindControl("TextBox1")).Text;
       Response.Write(textBoxText);
       // Selects the text from the DropDownList

       // which is inside the GridView control

       string dropDownListText = ((DropDownList)
          row.FindControl("DropDownList1")).SelectedItem.Value;
       Response.Write(dropDownListText);
       // Selects items from the ListBox

       // which is inside the GridView control

       ListBox myListBox = (ListBox)row.FindControl("ListBox1");

       foreach(ListItem selectedItem in myListBox.Items)
       {
           // Checks if the item in the ListBox is selected or not

           if (selectedItem.Selected)
           {
               // Print the value of the item if its selected

               Response.Write(selectedItem.Value);
           }
       }


}