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public partial class Form1 : Form

   public Form1()
   {
      InitializeComponent();
   }

   private void Form1_Load(object sender, EventArgs e)
   {

   }

}					

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        private void CreateButton()
        {
            Button mybutton = new System.Windows.Forms.Button();
            mybutton.Location = new System.Drawing.Point(10, 10);
            mybutton.Name = "mybutton";
            mybutton.Size = new System.Drawing.Size(162, 41);
            mybutton.TabIndex = 1;
            mybutton.Text = "mybutton";
            mybutton.UseVisualStyleBackColor = true;
            mybutton.Click += new System.EventHandler(this.mybutton_Click);
            this.Controls.Add(mybutton);
        }
        private void mybutton_Click(object sender, EventArgs e)
        {
        }					

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this.Controls.Add(mybutton);					

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Controls.Add(...);					

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    public class Form1 : Form
    {
        public Form1()
        {
            GuiGenerator g = new GuiGenerator();
            g.GenerateGUI(this);
        }

        /* ... */
    }

    public class GuiGenerator
    {
        // ggf. auch als static
        public void GenerateGUI(Form form)
        {
            form.Text = "Sample Form";

            Button b = new Button();
            b.SetBounds(10, 10, 100, 20);
            b.Text = "Test Button";
            // Hinzufügen
            form.Controls.Add(b);

            Label l = new Label();
            l.SetBounds(10, 50, 100, 20);
            l.Text = "Test Label";
            // Hinzufügen
            form.Controls.Add(l);
        }
    }					

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class GenerationGUI
{
     private Form CurrentForm;
     public Button Streaming { get; set; }
     public Button Reading { get; set; }

     public GenerationGUI(Form CurrentForm)
     {
            this.CurrentForm = CurrentForm;
     }

     public void generateGUI(Form CurrentForm)
     {
     
         //Erster Button
         Streaming = new Button();

         Streaming.Location = new System.Drawing.Point(6, 45);
         Streaming.Name = "cmdStreaming";
         Streaming.Size = new System.Drawing.Size(104, 23);
         Streaming.TabIndex = 3;
         Streaming.Text = "Speichern (Datei)";
         Streaming.UseVisualStyleBackColor = true;
     
         CurrentForm.Controls.Add(Streaming);

     
         //Zweiter Button
         Reading = new Button();

         Reading.Location = new System.Drawing.Point(116, 45);
         Reading.Name = "cmdReading";
         Reading.Size = new System.Drawing.Size(89, 23);
         Reading.TabIndex = 4;
         Reading.Text = "Öffnen (Datei)";
         Reading.UseVisualStyleBackColor = true;
     
         CurrentForm.Controls.Add(Reading);

     }					

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GenerationGUI ref = new GenerationGUI(this)
ref.generateGUI(this);