这个是连接  http://www.c-sharpcorner.com/upl ... images-to-database/

After some correction,   " p.ProductType = txtName.Text;"  the "p" in Presentation layer still got problems. What is the problem? Thanks!

Presentation Layer

You have to write the code under Button:

protected void Button2_Click(object sender, EventArgs e)
    {
        lblMessage.Visible = true;
        p.ProductType = txtName.Text;
        if (FileUpload1.PostedFile != null &&
            FileUpload1.PostedFile.FileName != "")
        {
            byte[] imageSize = new byte
                          [FileUpload1.PostedFile.ContentLength];
            HttpPostedFile uploadedImage = FileUpload1.PostedFile;
            uploadedImage.InputStream.Read
               (imageSize, 0, (int)FileUpload1.PostedFile.ContentLength);
            p.Image = imageSize;
        }

       p.InsertProducts();
        lblMessage.Text = "File Uploaded";
    }

Business Access Layer

public void InsertProducts()
    {
        SqlParameter[] p=new SqlParameter[2];
        p[0]=new SqlParameter("@ProductType",producttype);
        p[0].DbType=DbType.String;
        p[1]=new SqlParameter("Image",image);
        SqlHelper.ExecuteNonQuery(clsConnection.Connection,