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Form frm  = new Form(Passwort);
frm.ShowDialog();					

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        IUserControl _activeUserControl;

        private IUserControl CreateUserControl(Type userControl)
        {
            UserControl ctrl = (UserControl)Activator.CreateInstance(userControl);
            Type iuc = userControl.GetInterface("IUserControl");
            if (iuc != null)
            {
                panUserControlType.Controls.Add(ctrl);
                ctrl.Dock = DockStyle.Fill;
                ctrl.Parent = panUserControlType;

                return (IUserControl)ctrl;
            }
            else
                return null;
        }

        public async void CreateUserControl(UserControlType ucType)
        {
            try
            {
                if (_activeUserControl != null)
                {
                    _activeUserControl.SaveSettings();

                    _activeUserControl.Dispose();
                    _activeUserControl = null;
                }

                switch (ucType)
                {
                    case UserControlType.About:
                        _activeUserControl = CreateUserControl(typeof(FrmPartAbout));
                        break;
                }

                lblUserControlType.Text = _activeUserControl.UcText;
                picUserControlType.Image = _activeUserControl.UcImgage;
            }
            catch(Exception ex)
            {
                _log.Error($"Fehler beim Erstellen eines UserControls vom Type {ucType.GetType()}", ex);
            }
        }					

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Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new splashscreen());					

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this.sfButton1.AccessibleName = "Button";
this.sfButton1.BackColor = System.Drawing.Color.White;
this.sfButton1.Font = new System.Drawing.Font("Segoe UI Semibold", 9F);
this.sfButton1.Location = new System.Drawing.Point(330, 319);
this.sfButton1.Name = "sfButton1";
this.sfButton1.Size = new System.Drawing.Size(96, 60);
this.sfButton1.Style.BackColor = System.Drawing.Color.White;
this.sfButton1.TabIndex = 34;
this.sfButton1.Text = "Anmelden";
this.sfButton1.UseVisualStyleBackColor = false;
this.sfButton1.Click += new System.EventHandler(this.sfButton1_Click);					

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var splash = new splashscreen();
Application.Run(splash);					

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GDISClient
{
    public class Program : ApplicationContext
    {
        Form mainForm = null;
        private static void Main(string[] args)
        {
            Program context = new Program(new Form1(), new splashscreen());

            Application.Run(context);
        }

        public Program(Form mainForm, Form splashForm) : base(splashForm)
        {
            this.MainForm = mainForm;
        }
    }
}					

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using...
namespace GDISClient
{
    public partial class form_main : Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
       

        public splashscreen form2;

        public form_main(splashscreen form2)
        {
            this.form2= form2;
        }
...
    }
}					

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using...

namespace GDISClient
{
    public partial class splashscreen : Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        /// 
        public form_main form1;

        public splashscreen(form_main form1)
        {
            this.form1 = form1;
        }
...
    }
}					

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using (var splashscreen = new splashscreen(this))					

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  form_main form_main = (form_main)Application.OpenForms["form_main"];					

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using (var splashscreen = new Splashscreen()) // Klassennamen sollten mit einem Großbuchstaben beginnen!
{
  DialogResult result = splashscreen.ShowDialog();
  // evtl. auf 'result' abfragen (OK, Cancel, ...)
}					

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splashscreen splashscreen = (splashscreen)Application.OpenForms["splashscreen"];					

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splashscreen splashscreen = (splashscreen)Application.OpenForms["splashscreen"];
form_main form_main1 = (form_main)Application.OpenForms["form_main"];
pwchange pwchange1 = (pwchange)Application.OpenForms["pwchange"];
info_screen info_screen1 = (info_screen)Application.OpenForms["info_screen"];
fulltable fulltable = (fulltable)Application.OpenForms["fulltable"];
debugform debugform = (debugform)Application.OpenForms["debugform"];					

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using (var splashscreen = new Splashscreen()) // Klassennamen sollten mit einem Großbuchstaben beginnen!
{
  DialogResult result = splashscreen.ShowDialog(); 
}					

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private NonModalForm _nonModalForm;

void ShowNonModalForm()
{
  if (_nonModalForm == null)
     _nonModalForm = new NonModalForm();

  _nonModalForm.Show(this);
}					

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namespace GDISClient
{
    public class Program : ApplicationContext
    {
        public Form_main mainForm = null;
       
        public static int startvar = 0;

        private static void Main(string[] args)
        {
            //Program context = new Program(new Form_main(new Debugform(), new Fulltable(), new Pwchange(), new Splashscreen(), new Info_screen()));
            var splash = new Splashscreen(new Form_main());
            Application.Run(splash);
        }
        public Program(Form_main mainForm)
        {
            this.mainForm = mainForm;
       
        }
    }
}					

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namespace GDISClient
{
    public partial class Splashscreen : Form
    {
        public Form_main mainForm;

        public Splashscreen(Form_main mainForm)
        {
            this.mainForm = mainForm;
        }

        private System.ComponentModel.IContainer components = null;

        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        private pwencode encoder = new pwencode();
        private dbcon mysqlcon = new dbcon(mainForm); // das hier funktioniert noch nicht, da der nicht statische verweis nicht auf die methode oder eigenschaft verweisen kann
        private useraccess UA = new useraccess();
    }
}					

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namespace GDISClient
{
    public class dbcon 
    {
        private MySqlConnection Con = new MySqlConnection();
        private MySqlConnection ConVJ = new MySqlConnection();
        private readonly string MySQLConnString = "...." //not of interest here
        public DataTable Table = new DataTable();

        public dbcon(Form_main mainForm)
        {
            this.mainForm = mainForm;
            Connectiontest();
        }

        public dbcon()
        {
           
            Connectiontest();
          
        }
        private Form_main mainForm;
   
   ...
   
   }
}