-將DropDownList控件綁定 到GridView控當中,並調用方法給DropDownList控件在頁面進行數據綁定

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<asp:TemplateField HeaderText="銷售情況">
 <ItemTemplate>
 <asp:DropDownList ID="SellState" runat="server" DataSource='<%# ddlbind()%>'
   DataValueFiled="SellState" DataTextFiled="SellState" OnSelectedChanged="DropDownList_SelectedChanged"
AutoPostBack="true">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>

//後臺查詢方法
public SqlDataReader ddlbind()
{
  string strsql="select distinct SellState from Sellbook";
SqlConnection conn = GetConnection();
SqlCommand cmd = new SqlCommand(strsql,conn);
cmd.open();
return cmd.ExecuteReader();
}