datagrid 控件绑定!!紧急求助!!
各位朋友们帮忙解决下我的问题吧:
先发下我的 页面的源码
<body>
     <form id="form1" runat="server">
      <div align=center> <uc2:Header ID="Header2" runat="server" /></div>      
         <div align=center><asp:Label ID="Label1" runat="server" Width="400px"><font color="#65186d" size=4 > <b> <%=Session["Username"] %>老师您好,欢迎您光临本网站!</b></font> </asp:Label></div>
     <br />
     <table cellSpacing="1" cellPadding="0" width="800" align=center bgColor="FDF5E6" border="0">     
    <div align=left><A href="Index.aspx">回到首页</A>-><A href="#"><font color="#00c100"><b>学生向我提问的问题:</b></font></A> </div>      
     </table>      
     <table  cellSpacing="1" cellPadding="0" width="800" align="center" bgColor="FDF5E6" border="0">				
					<tr bgColor="#ffffff">
						<td colSpan="2">
							<asp:DataGrid id="subpro" runat="server" HorizontalAlign="Center" AutoGenerateColumns="False"
								PageSize="30" AllowPaging="True" OnPageIndexChanged="Get_Page" OnItemCommand="subpro_ItemCommand" >
								<Columns>
									<asp:TemplateColumn>										
										<ItemTemplate>
											<TABLE cellSpacing="0" cellPadding="0" width="700" align="center" border="0" >
												<TR>
													<TD bgColor="FDF5E6" colSpan=2 height=25>
														<DIV align="left"><FONT color=green size="3"></font>  <font size=3 color=DarkSlateGray ><%# DataBinder.Eval(Container.DataItem, "Pro_author") %></font>  <STRONG>同学</STRONG>  <FONT size="2"><STRONG>  <font size="3">于</font>  <font size=3 color=DarkSlateGray ><%# DataBinder.Eval(Container.DataItem, "Pro_date") %></font>  <font size="3">向您提交了问题标题:</font>  <font size=3 color=DarkSlateGray ><%# DataBinder.Eval(Container.DataItem, "Pro_title") %></font></STRONG></FONT></FONT></DIV>
													</TD>
												</TR>
												<TR>
													<TD style="HEIGHT: 31px" colSpan="2"><FONT style="FONT-SIZE: 12px"><FONT size="3"><strong>内容为</strong>  <%# DataBinder.Eval(Container.DataItem, "Pro_content") %></FONT><STRONG><FONT size="2"></FONT></STRONG><BR>
														</FONT>
													</TD>
												</TR>												
											</TABLE>                                          
										</ItemTemplate>
									</asp:TemplateColumn>
                                     <asp:ButtonColumn CommandName="Select" Text="回复" ></asp:ButtonColumn>
								</Columns>
								<PagerStyle PageButtonCount="20" Mode="NumericPages"></PagerStyle>								
							</a