文件删除，移动，复制

1：删除

            try
            {
                //指定路径和文件名
                string filePath = Path.Combine(System.Web.Hosting.HostingEnvironment.MapPath("~/upload"), "b.doc");
                string query = "确定要删除该文件\n" + filePath + "?";
                if (MessageBox.Show(query, "删除文件?", MessageBoxButtons.YesNo) == DialogResult.Yes)
                {
                    File.Delete(filePath);
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show("无法删除该文件，以下异常！" + "发生:\n" + ex.Message, "失败");        
            }

2：移动

            try
            {
                //指定路径和文件名
                string filePath = Path.Combine(System.Web.Hosting.HostingEnvironment.MapPath("~/upload"), "b.doc");
                string query = "确定要移动该文件\n" + filePath + "?";
                if (MessageBox.Show(query, "移动文件?", MessageBoxButtons.YesNo) == DialogResult.Yes)
                {
                    File.Move(filePath, System.Web.Hosting.HostingEnvironment.MapPath("~/Newupload/") + "NewfileName.doc");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("无法移动该文件，以下异常！" + "发生:\n" + ex.Message, "失败");
            }

3：复制

            try
            {
                //指定路径和文件名
                string filePath = Path.Combine(System.Web.Hosting.HostingEnvironment.MapPath("~/upload"), "b.doc");
                string query = "确定要复制该文件\n" + filePath + "?";
                if (MessageBox.Show(query, "复制文件?", MessageBoxButtons.YesNo) == DialogResult.Yes)
                {
                    File.Copy(filePath, System.Web.Hosting.HostingEnvironment.MapPath("~/Newupload/") + "NewfileName.doc");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("无法复制该文件，以下异常！" + "发生:\n" + ex.Message, "失败");
            }