Page_Load（）保存到数据库

Question

我如何在C＃中使用Page_Load（）保存到数据库，我一直试图保存到MSSQL数据库中，但该列非常空白，而这些列中没有任何内容，因此我需要帮助ASP.NET的新手介绍

我的代码如下：

protected void Page_Load(object sender, EventArgs e)
{
    string firstname = Request.QueryString["firstname"];
    string lastname = Request.QueryString["lastname"];
    string email = Request.QueryString["email"];

    //Put user code to initialize the page here
    Topaz.SigPlusNET sigObj = new Topaz.SigPlusNET();
    sigObj.AutoKeyStart();

    //use the same data to decrypt signature
    sigObj.SetAutoKeyData(Request.Form["username"]);

    sigObj.AutoKeyFinish();
    sigObj.SetSigCompressionMode(1);
    sigObj.SetEncryptionMode(2);

    //Now, get sigstring from client
    //Sigstring can be stored in a database if 
    //a biometric signature is desired rather than an image
    //sigObj.SetSigString(Request.Form["hidden"]);
    if (sigObj.NumberOfTabletPoints() > 0)
    {
        sigObj.SetImageFileFormat(0);
        sigObj.SetImageXSize(500);
        sigObj.SetImageYSize(150);
        sigObj.SetImagePenWidth(8);
        sigObj.SetJustifyX(5);
        sigObj.SetJustifyY(5);
        sigObj.SetJustifyMode(5);
        System.Drawing.Image img = sigObj.GetSigImage();
        base64ImageString = ImageToBase64(img, System.Drawing.Imaging.ImageFormat.Jpeg);

        if (base64ImageString.Length > 3000)
        {
            using (SqlConnection con = new SqlConnection(constring))
            {
                con.Open();
                string sql = "insert into SakalPicturecontrol (firstname,lastname,email,base64ImageString) Values (@firstname,@lastname,@email,@base64ImageString)";
                try
                {
                    using (SqlCommand cmd = new SqlCommand(sql, con))
                    {
                        cmd.Parameters.AddWithValue("@firstname", firstname);
                        cmd.Parameters.AddWithValue("@lastname", lastname);
                        cmd.Parameters.AddWithValue("@email", email);
                        cmd.Parameters.AddWithValue("@base64ImageString", base64ImageString);
                        cmd.ExecuteNonQuery();
                        Response.Write("Information has been saved Correctly..");
                        con.Close();
                    }
                }
                catch (Exception ex)
                {
                    Response.Write("Error: " + ex.ToString());
                }
            }
        }

    }
    else
    {
        //signature has not been returned successfully!
    }
}