将DataGrid数据写入Excel文件
程序代码：
this.EnableViewState = false;
System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN",true);
System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
this.DataGrid1.RenderControl(oHtmlTextWriter);
Response.Write(oStringWriter.ToString());
Response.End();
原理也就是把DataGrid的信息以流的形式写到html输出流的形式实现，自己尝试下，好像可以。我装的windowxp sp2版的，后来到同事的机器上去试，结果就出问题了，每次执行的时候，弹出那个【打开、保存、取消】的页面，再一点，结果整个站点的页面都关闭了，再到其他机器上去试，结果有的能正常下载，有的就不行，以前听说过有这么个问题，好像也没什么好的办法解决。
后来考虑了下，何必不直接把写到html流的信息直接写到一个excel文件里面去让客户直接下载excel，于是稍微修改了下别人的源码，直接生成Excel文件来让客户下载，演示源代码如下：
WebForm4.aspx----Html部分：
程序代码：
<%@ Page language="c#" Codebehind="WebForm4.aspx.cs" AutoEventWireup="false" Inherits="WebUI.WebForm4" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm4</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:datagrid id="DataGrid1" runat="server" width="100%">
<ItemStyle HorizontalAlign="Center"></ItemStyle>
<HeaderStyle HorizontalAlign="Center"></HeaderStyle>
<FooterStyle HorizontalAlign="Center"></FooterStyle>
<PagerStyle PageButtonCount="15" Mode="NumericPages"></PagerStyle>
</asp:datagrid>
<asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 152px" runat="server"
Text="Button"></asp:Button>
</form>
</body>
</HTML>
页面上就一个DataGrid和一个按钮，按钮用来触发将数据到Excel，后台的其他代码也就不弄上来了，下面是那个关键的按钮事件
程序代码：
private void Button1_Click(object sender, System.EventArgs e)
{
DataTable SourceTb = new DataTable();
DataColumn myDataColumn;
myDataColumn = new DataColumn();
myDataColumn.DataType = System.Type.GetType("System.String");
myDataColumn.ColumnName = "RowIndex"; //序 号
SourceTb.Columns.Add(myDataColumn);
myDataColumn = new DataColumn();
myDataColumn.DataType = System.Type.GetType("System.String");
myDataColumn.ColumnName = "CheckUpManName"; //审批人
SourceTb.Columns.Add(myDataColumn);
myDataColumn = new DataColumn();
myDataColumn.DataType = System.Type.GetType("System.String");
myDataColumn.ColumnName = "CheckUpIdeas"; //审批意见
SourceTb.Columns.Add(myDataColumn);
myDataColumn = new DataColumn();
myDataColumn.DataType = System.Type.GetType("System.String");
myDataColumn.ColumnName = "CheckUpDate"; //审批时间
SourceTb.Columns.Add(myDataColumn);
myDataColumn = new DataColumn();
myDataColumn.DataType = System.Type.GetType("System.String");
myDataColumn.ColumnName = "CheckUpRole"; //审批岗位
SourceTb.Columns.Add(myDataColumn);
myDataColumn = new DataColumn();
myDataColumn.DataType = System.Type.GetType("System.String");
myDataColumn.ColumnName = "HandleType"; //操作类型（1：提交| 9：驳回）
SourceTb.Columns.Add(myDataColumn);
DataRow myDataRow;
for(int i = 0;i < 30;i ++)
{
myDataRow = SourceTb.NewRow();
myDataRow["RowIndex"] = i.ToString();
myDataRow["CheckUpManName"] = "张三";
myDataRow["CheckUpIdeas"] = "同意";
myDataRow["CheckUpDate"] = "2006-03-20";
myDataRow["CheckUpRole"] = "物资部主任";
SourceTb.Rows.Add(myDataRow);
}
//绑定数据到DataGrid1
this.DataGrid1.DataSource = SourceTb.DefaultView;
this.DataGrid1.DataBind();
//将DataGrid1构成的html代码写进StringWriter
this.DataGrid1.Page.EnableViewState = false;
System.IO.StringWriter tw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
this.DataGrid1.RenderControl(hw);
string HtmlInfo = tw.ToString().Trim();
string DocFileName = "审批信息.xls";
string FilePathName = Request.PhysicalPath;
FilePathName = FilePathName.Substring(0,FilePathName.LastIndexOf("\\"));
//得到Excel文件的物理地址
FilePathName = FilePathName +"\\" + DocFileName;
System.IO.File.Delete(FilePathName);
FileStream Fs = new FileStream(FilePathName, FileMode.Create);
BinaryWriter BWriter= new BinaryWriter(Fs,System.Text.Encoding.GetEncoding("GB18030"));
//将DataGrid的信息写入Excel文件
BWriter.Write(HtmlInfo);
BWriter.Close();
Fs.Close();
}
好了，写入信息到Excel文件成功了，至于说生成的Excel文件在哪里，大家一看就应该知道，要下载的话，也就是很简单的<a href='Excel文件路径'>文件下载</a>