Just publish the form programmatically and everything in the form will
automatically be submitted. You may use the following code to submit:

public void FormEvents_Submit(object sender, SubmitEventArgs e)
       {
           
           FileSubmitConnection fc =
(FileSubmitConnection)this.DataConnections["Main submit"];
           // Modify the URL we want to submit to by concatenating the
           string dLocation = this.Location.ToString();
           fc.FolderUrl = dLocation.Substring(0, dLocation.LastIndexOf("/"));

           // Execute the submit connection
           try
           {

               fc.Execute();

               e.CancelableArgs.Cancel = false;

           }

           catch (Exception ex)
           {

               e.CancelableArgs.Cancel = true;
           }

Location is a local variable. You can skip it and use the following line
instead:

string dLocation = "http://server/dolib/forms/AllItems.aspx"; --> This is
just a sample, use the exact complete library URL here and you can also
capture the url programmatically. For example,

dLocation = this.Template.Uri.ToString();

Hope this helps

SSA
MOSS MVP