Asp.Net上传文件并配置可上传大文件的方法

<form  enctype="multipart/form- data">
  <input type="file" name="myfile"/>
</form>

//上传文件保存路径  
string savePath = Server.MapPath("UploadFiles") + "\\";

//提供对客户端上载文件的访问
HttpFileCollection uploadFiles = System.Web.HttpContext.Current.Request.Files;

for (int i = 0; i < uploadFiles.Count; i++)
{
    System.Web.HttpPostedFile postedFile = uploadFiles[i];
    string fileName = postedFile.FileName;//完整的路径
    fileName = System.IO.Path.GetFileName(postedFile.FileName); //获取到名称
    string fileExtension = System.IO.Path.GetExtension(fileName);//文件的扩展名称
    string type = fileName.Substring(fileName.LastIndexOf(".") + 1);    //类型  
    if (uploadFiles[i].ContentLength > 0)
        uploadFiles[i].SaveAs(savePath + fileName);
}

<form id="form1" runat="server">
    <div>
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <br /><br />
        <asp:Button ID="btnsave" runat="server" onclick="btnsave_Click"  Text="Save" style="width:85px" />
        <br /><br />
        <asp:Label ID="lblmessage" runat="server" />
    </div>
</form>

protected void btnsave_Click(object sender, EventArgs e)
{
    StringBuilder sb = new StringBuilder();

    if (FileUpload1.HasFile)
    {
        try
        {
            sb.AppendFormat(" Uploading file: {0}", FileUpload1.FileName);

            //saving the file
            FileUpload1.SaveAs("<c:\\SaveDirectory>" + FileUpload1.FileName);

            //Showing the file information
            sb.AppendFormat("<br/> Save As: {0}", FileUpload1.PostedFile.FileName);
            sb.AppendFormat("<br/> File type: {0}", FileUpload1.PostedFile.ContentType);
            sb.AppendFormat("<br/> File length: {0}", FileUpload1.PostedFile.ContentLength);
            sb.AppendFormat("<br/> File name: {0}", FileUpload1.PostedFile.FileName);

        }
        catch (Exception ex)
        {
            sb.Append("<br/> Error <br/>");
            sb.AppendFormat("Unable to save file <br/> {0}", ex.Message);
        }
    }
    else
    {
        lblmessage.Text = sb.ToString();
    }
}

<system.web>      
    <httpRuntime maxRequestLength="102400" useFullyQualifiedRedirectUrl="true" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100" enableVersionHeader="true"/>
</system.web>