添加引用：C:\Program Files\Microsoft SQL Server\80\Tools\Binn\SQLDMO.DLL

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using SQLDMO;//这里添加命名空间

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

}
    protected void Button1_Click(object sender, EventArgs e)
    {
       
        this.Label1.Visible = true;
        this.Label1.Text = "  正在进行档案库的数据备份，这可能需要几秒到几十的时间，请稍候...";
       // string filepath = this.File1.Value;
        //Response.Write(filepath);
        try
        {
            SQLDMO.Backup backup = new BackupClass();//我用的是完全引用
            SQLServer sqlserver = new SQLServerClass();
            sqlserver.LoginSecure = false;
            sqlserver.Connect(".", "sa", "");
            backup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;
            backup.Database = "lcm_jkpg"; //数据库名     
            backup.Files = @"e:\aa\db.bak";  //备份的路径   
            //backup.BackupSetName = "lcm_jkpg";  //说的是设置名字但是还是按照,备份路径的名字        
            //backup.BackupSetDescription = "数据库备份"; //描述 没撒用  
            backup.Initialize = true; ;
            backup.SQLBackup(sqlserver);
        }
        catch (Exception ex)
        {
            this.Label1.Text = "数据备份失败  \t" + ex.Message;
        }
        this.Label1.Visible = false;
     
    }
}