鼠标拖动excel文档到网页

请问怎么实现鼠标拖动Excel文档到网页，并把路径赋值到文本框。去写的下面的代码没有触发。        public partial class Form1 : Form
        {
            string fileName = string.Empty;
            public Form1()
            {
                InitializeComponent();
                this.Load += new EventHandler(Form1_Load);
                this.DragEnter += new DragEventHandler(Form1_DragEnter);
                this.DragDrop += new DragEventHandler(Form1_DragDrop);
            }            private void InitializeComponent()
            {
                throw new NotImplementedException();
            }            void Form1_Load(object sender, EventArgs e)
            {
                this.AllowDrop = true;
            }            void Form1_DragEnter(object sender, DragEventArgs e)
            {
                if (e.Data.GetDataPresent(DataFormats.FileDrop)) e.Effect = DragDropEffects.All;                else e.Effect = DragDropEffects.None;
            }            void Form1_DragDrop(object sender, DragEventArgs e)
            {
                //获取第一个文件名
                fileName = (e.Data.GetData(DataFormats.FileDrop, false) as String[])[0];
                try
                {
                    //this.pictureBox1.ImageLocation = fileName;
                    
                }
                catch (Exception)
                { }
            }
        }