....
form_GS_Analysis.cmd_Close_with_Chart.Click += new System.EventHandler(form_GS_Analysis_GetChart_Click);
....

public void form_GS_Analysis_GetChart_Click(object sender, EventArgs e)
{
   MessageBox.Show("Test");
   form_GS_Analysis.cmd_Close_with_Chart.Click -= form_GS_Analysis_GetChart_Click;
}

Form_GS_Analysis form_GS_Analysis;

private void GSA_Open_Form()
{
//Form wird initialisiert
form_GS_Analysis = new Form_GS_Analysis();
form_GS_Analysis.FormClosed += new FormClosedEventHandler(form_GS_Analysis_FormClosed);

 //Form AssistCA wird angezeigt
form_GS_Analysis.Show();
}

private void form_GS_Analysis_FormClosed(object sender, FormClosedEventArgs e)
 /*
      tritt ein, wenn AssistCA geschlossen wird
 */
 {
            //Handler wird beendet
            form_GS_Analysis.FormClosed -= form_GS_Analysis_FormClosed;
            gBx_GSA.Visible = false;

            //Marker wird deaktiviert
            Is_GSAform_open = false;
}

 MyMessageBox_Global myMSG = new MyMessageBox_Global();
 DialogResult dialog = myMSG.Get_DiaResult("Test 1 2 3 ", "hier steht die Nachricht", MyMessageBox_Global.msgButton.JaNein_Cancel, MyMessageBox_Global.msgIcon.Fehler, false);
 if(dialog == DialogResult.Yes)
            {........

MyMessageBox_Global.Get_DiaResult(......)

string Text = XXX.Label_Text;
SizeF TextSize = TextRenderer.MeasureText(Text, new Font(Font_OCR_Label.Name, Font_Size_temp));

StringFormat sf = new StringFormat();

if(Text == einzeilig)
{
    sf.Alignment = StringAlignment.Center;
}
else
{
   sf.Alignment = StringAlignment.Near;
}

try
            {
                Microsoft.Office.Interop.Outlook.Application OL = new Microsoft.Office.Interop.Outlook.Application();
                Microsoft.Office.Interop.Outlook.MailItem Mail = OL.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem);
                Mail.Subject = Betreff;
                Mail.To = Empfaenger;
                Mail.Body = Nachricht;
                Mail.Display(false);
                Nachricht = string.Empty;
                Mail.Send();
                OL.Quit();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Exception");
            }

DataGridView LoadImages_Info = new DataGridView();

private void Save_Project_Click(object sender, EventArgs e)
        {
            if (savFD_save_project.ShowDialog() == DialogResult.OK)
            {
                string SaveFile = savFD_save_project.FileName; //Filename mit Pfad
                Save_Listen_Recovery();
                Save_Messung_Daten_List(SaveFile, Liste_Recovery_Project);
            }
        }

private void Save_Listen_Recovery()
        {
            
            List<string> FileNames = new List<string>();

            foreach (DataGridViewRow row in dGV_ImageList.Rows)
            {
                FileNames.Add(dGV_ImageList.Rows[row.Index].Cells[5].Value.ToString());
                for (int i = 2; i < dGV_ImageList.Columns.Count; i++)
                {
                    LoadImages_Info.Columns.Add(i.ToString(),i.ToString());
                    LoadImages_Info.Rows.Add(dGV_ImageList.Rows[row.Index].Cells[i].Value);
                }
            }

            Liste_Recovery_Project.Add(new Liste_Recovery()
            {
                Liste_Messung_Recovery = Liste_Messung_Daten,
                FileListe_Recovery = FileNames,
                Image_DataGrid = LoadImages_Info
                
            });
        }

private void Save_Messung_Daten_List(string FilePath, List<Liste_Recovery> SaveList)
        {
            FileStream stream;
            stream = new FileStream(FilePath, FileMode.Create);
            BinaryFormatter formatter = new BinaryFormatter();
            formatter.Serialize(stream, SaveList);
            stream.Close();
            SaveList.Clear();
        }

[Serializable]
public class Liste_Recovery
{
    public List<Liste_Messung> Liste_Messung_Recovery { get; set; }
    public List<string> FileListe_Recovery { get; set; }
    public DataGridView Image_DataGrid { get; set; }
}

XMLgenerator AdminXML = new XMLgenerator();

        public void Load_Settings()
        {
            AdminXML.Load();
            num_Messlinie_Thickness.Value = AdminXML.Messlinie_Thickness;
             ........
             ........
        }

[Serializable]
	class XMLgenerator
	{
	        public decimal Messlinie_Thickness;
		public SerializableFont Draw_Label_Image_Font, Draw_Label_Messlinie_Font;
		public decimal LinienEnde_Radius;
		public Color LinienEnde_Farbe;
		public Color Messlinie_Farbe, Draw_Guideline_Farbe;
		public bool NummerierungLinien;
		public int Messen_Text_Rundung;
		public string LDaten_Drive;
		public decimal Unit_Switch_PixelSize_threshold;

		
		private void SetDefaultValues()
		{
			this.Messlinie_Thickness = 1;
			this.Draw_Label_Image_Font = new SerializableFont(new Font("Arial", 8));
			this.Draw_Label_Messlinie_Font = new SerializableFont(new Font("Arial", 8));
			this.LinienEnde_Radius = 1;
			this.LinienEnde_Farbe = Color.Red;
			
			this.NummerierungLinien = false;
			this.Messen_Text_Rundung = 1;
			this.Unit_Switch_PixelSize_threshold = 10;
			this.LDaten_Drive = @"\\sdrsmalabp03\malab$";
		}

		// ---------------------------------------------------------------------------------------

		
		[XmlIgnore]
		public const string FileName = "......\Programmdaten\\admin_config.dat";

		
		[XmlIgnore]
		public static XMLgenerator Setting { get; set; }

		
		public XMLgenerator()
		{
		}

		public static void Default()
		{
			XMLgenerator.Setting = new XMLgenerator();
			XMLgenerator.Setting.SetDefaultValues();
		}
		
		public XMLgenerator Load()
		{
		
			var serializer = new DataContractSerializer(typeof(XMLgenerator));
			using (var stream = new XmlTextReader(FileName))
			{
				XMLgenerator config = serializer.ReadObject(stream) as XMLgenerator;
				return config;
			}

		}


		public void Save()
		{
			var serializer = new DataContractSerializer(typeof(XMLgenerator));
			using (var stream = new XmlTextWriter(FileName, Encoding.Unicode))
			{
				serializer.WriteObject(stream, this);
			}
		}
	}


	[DataContract]
	internal class Setting
	{
		[DataMember]
		public decimal Messlinie_Thickness { get; set; }
		[DataMember]
		public SerializableFont Draw_Label_Image_Font { get; set; }
		[DataMember]
		public decimal LinienEnde_Radius { get; set; }
		[DataMember]
		public SerializableFont Draw_Label_Messlinie_Font { get; set; }
		[DataMember]
		public Color LinienEnde_Farbe { get; set; }
		[DataMember]
		public Color Messlinie_Farbe { get; set; }
		[DataMember]
		public Color Draw_Guideline_Farbe { get; set; }
		[DataMember]
		public bool NummerierungLinien { get; set; }
		[DataMember]
		public int Messen_Text_Rundung { get; set; }
		[DataMember]
		public string LDaten_Drive { get; set; }
		[DataMember]
		public decimal Unit_Switch_PixelSize_threshold { get; set; }

	}

public void Save()
		{
			
			var serializer = new DataContractSerializer(typeof(XMLgenerator));
			using (var stream = new XmlTextWriter(FileName, Encoding.Unicode))
			{
				serializer.WriteObject(stream, this);
			}
		}

public XMLgenerator Load()
		{
		
			var deserializer = new DataContractSerializer(typeof(XMLgenerator));
			using (var stream = new XmlTextReader(FileName))
			{
				XMLgenerator config = deserializer.ReadObject(stream) as XMLgenerator;
				return config;
			}

		}

Form_Kalibrierungsfenster _Kalibrierungsfenster;

        public void Berechnung_Kalibrierung()
        {
            

            if (WaitHandler == false)
            {
                
                _Kalibrierungsfenster = new Form_Kalibrierungsfenster();
                _Kalibrierungsfenster.Show();
                _Kalibrierungsfenster.TopMost = true;
                _Kalibrierungsfenster.lbl_Bilddaten.Text = Image_Width.ToString() + " x " + Image_Height.ToString() + " Pixel";

            }
            else if (WaitHandler == true)
            {
                WaitHandler = false;
                _Kalibrierungsfenster.lbl_PixelSize.Text = Math.Round(PixelSize_Kali, 5).ToString() + " " + Kali_Unit_Input + " pro Pixel";

            }
        }

       Form_Kalibrierungsfenster _Kalibrierungsfenster = new Form_Kalibrierungsfenster();
        
        public void Berechnung_Kalibrierung()
        {
            
            if (WaitHandler == false)
            {
                _Kalibrierungsfenster.lbl_Bilddaten.Text = Image_Width.ToString() + " x " + Image_Height.ToString() + " Pixel";

                _Kalibrierungsfenster.Show();
                _Kalibrierungsfenster.TopMost = true;

            }
            else if (WaitHandler == true)
            {
                WaitHandler = false;
                _Kalibrierungsfenster.lbl_PixelSize.Text = Math.Round(PixelSize_Kali, 5).ToString() + " " + Kali_Unit_Input + " pro Pixel";

            }
        }

 Form_Kalibrierungsfenster _Kalibrierungsfenster;
        
        public void Berechnung_Kalibrierung()
        {
            _Kalibrierungsfenster = new Form_Kalibrierungsfenster();

            if (WaitHandler == false)
            {
                _Kalibrierungsfenster.lbl_Bilddaten.Text = Image_Width.ToString() + " x " + Image_Height.ToString() + " Pixel";

                _Kalibrierungsfenster.Show();
                _Kalibrierungsfenster.TopMost = true;

            }
            else if (WaitHandler == true)
            {
                WaitHandler = false;
                _Kalibrierungsfenster.lbl_PixelSize.Text = Math.Round(PixelSize_Kali, 5).ToString() + " " + Kali_Unit_Input + " pro Pixel";

            }
        }

if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                
                string[] selectedFiles = openFileDialog1.SafeFileNames;
                string[] files = openFileDialog1.FileNames;
                

                Bilder_Anzahl += files.Length;
                

                for (int i = 0; i < files.Length; i++)
                {
                ........

 private void picBox_Measurement_Overlay_MouseMove(object sender, MouseEventArgs e)
        {
            if (CenterCross_Active == true)
            {
                pictureBox_Image.Paint += new PaintEventHandler(pictureBox_Image_Paint);
                CenterCross_X = e.Location.X;
                CenterCross_Y = e.Location.Y;
                pictureBox_Image.Refresh();
            }
        }

private void togSW_CenterCross_CheckedChanged(object sender, EventArgs e)
        {
            if (togSW_CenterCross.Checked == true)
            {
                CenterCross_Active = true;
            }
            else if (togSW_CenterCross.Checked == false)
            {
                CenterCross_Active = false;
                pictureBox_Image.Paint -= new PaintEventHandler(pictureBox_Image_Paint);
                pictureBox_Image.Refresh();
            }
        }
        
private void pictureBox_Image_Paint(object sender, PaintEventArgs e)
        {
                Pen CenterCross = new Pen(Color.Blue);
                e.Graphics.DrawLine(CenterCross, CenterCross_X, 0, CenterCross_X, pictureBox_Image.Height);
                e.Graphics.DrawLine(CenterCross, 0, CenterCross_Y, pictureBox_Image.Width, CenterCross_Y);
        }