File Upload In Asp.net Using C#

Simply drop  the File Upload control from Toolbox to a Web page. 
Or Written Code To  in Asp .net Page  where you want

<asp:FileUpload ID="fileUpload1" runat="server" />

Click On File Upload Control and Select File Then Click On Upload Button

Write File Upload Code on Button Click

    protected void btnUploadFile_Click(object sender, EventArgs e)
    {
        int attachedsize = 0;

        string path = "";

        string filename = "";

        //File Upload Code

        if (fileUpload1.HasFile)
        {
            //The size of the uploaded file, in bytes. 5 MB

            if (fileUpload1.PostedFile.ContentLength < 5242880)
            {
                attachedsize = fileUpload1.PostedFile.ContentLength;
                try
                {
                    filename = Path.GetFileName(fileUpload1.FileName);

                    string fName = Path.GetFileNameWithoutExtension(fileUpload1.FileName);

                    string extension = System.IO.Path.GetExtension(filename);

                    filename = fName + extension;

                    path = "~/Document/Request/" + filename;

                    fileUpload1.SaveAs(Server.MapPath(path));

                }

                catch (Exception ex)
                {

                }
            }
        }
    }