GridView(DataGrid)中使用DropDownList，附代码，测试有效

<asp:GridView ID="gridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="gridView1_RowDataBound">
<Columns>
<asp:BoundField HeaderText="id" DataField="num" DataFormatString="{0}" >
<ItemStyle Width="150px" />
</asp:BoundField>
<asp:TemplateField HeaderText="drpID">
<ItemTemplate>
<asp:DropDownList ID="drpNum" runat="server" Width="150px" DataTextField="num" DataValueField="num" DataSource=<%# GetDataSet() %> AutoPostBack="True">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

//**** 自已写的DataTable ************/

public DataTable GetDataSet()
{
DataTable dt = new DataTable();
dt.Columns.Add("num");
object[] objs = new object[6];
for (int i = 0; i <= 5; i++)
{
objs[i] = new object();
objs[i] = i.ToString();
dt.Rows.Add(objs[i]);
}
return dt;
}

protected void gridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList drp = (DropDownList)e.Row.FindControl("drpNum");
drp.SelectedValue = e.Row.Cells[0].Text;
}
}

DataGrid 是一样的，将其中的e.Row改为e.Item 即可，测试有效。