Void method not collecting data

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C#

WinForms

How can I fill a class with textbox data and datagridvied data, and use the collected data on another form.

I created this class, to handle collected data

public class pos_data
{
	public int nr{ get; set; }
	public int barcode{ get; set; }
	public string name { get; set; }
	public int qty { get; set; }
	public float price { get; set; }
	public float TOTAL { get; set; }
	public float subtotal { get; set; }
	public float discount { get; set; }
	public float total{ get; set; }
	public DateTime date{ get; set; }
	public string user { get; set; }
	public string client { get; set; }
	public float valueofvatpcs { get; set; }
	public float valuewithoutvat{ get; set; }
	public int nrofarticles { get; set; }
	public float totalprice{ get; set; }
	public float totalvaluesVAT{ get; set; }
}

and create a method to collect data using object of class give in upper part of this question

void mbushe(object sender, EventArgs e)
{
   pos_data ad = new pos_data();
   for (int i = 0; i < dataTable.Rows.Count; i++)
   {
      ad.NR = int.Parse(txtnrfatures.Text);
      ad.totalvaluesVAT = float.Parse(textBox1.Text);
      ad.barcode= int.Parse(dataTable.Rows[i][0].ToString());
      ad.name= dataTable.Rows[i][1].ToString();
      ad.qty= int.Parse(dataTable.Rows[i][2].ToString());
      ad.price= int.Parse(dataTable.Rows[i][3].ToString());
      ad.vat = int.Parse(dataTable.Rows[i][4].ToString());
      ad.subtotal = float.Parse(txttotali.Text);
      ad.discount= float.Parse(txtzbritja.Text);
      ad.total= float.Parse(totali.Text);
      ad.date= DateTime.Now;
      ad.user = lbluser.Text;
      ad.client= cmbklienti.Text;
      ad.valuevatpcs = float.Parse(dataTable.Rows[i][7].ToString());
      ad.valuewithoutvat= float.Parse(dataTable.Rows[i][6].ToString());
      ad.nrofarticles= int.Parse(lblnumri.Text);
      ad.totalprice = float.Parse(dataTable.Rows[i][5].ToString());

      Program.dta.Add(ad);
}

dta is an static list declared on Program.cs

How can i pass these data on form 2 or form 3 depend of necessity to use this data.

I tried this code to use on form2/3, where I wanted the collected data to be used during the insertion process

private void button1_Click(object sender, EventArgs e)
{
	pos_data myData = new pos_data();

	string faturimi = "Metoda e pagesese" + ""+ "KESH;" +"Paguar"+ txtpaguar.Text + " "+ "Kusuri"+ textBox3.Text;

	con.Open();

	SqlCommand cmd = new SqlCommand("insertfaturimi", con);
	cmd.CommandType = CommandType.StoredProcedure;

	cmd.Parameters.Add(new SqlParameter("@nr", myData.NR));
	cmd.Parameters.Add(new SqlParameter("@client", myData.client));
	cmd.Parameters.Add(new SqlParameter("@payment", faturimi));
	cmd.Parameters.Add(new SqlParameter("@subtotal", myData.subtotal));
	cmd.Parameters.Add(new SqlParameter("@disount", myData.discount));
	cmd.Parameters.Add(new SqlParameter("@total", myData.total));
	cmd.Parameters.Add(new SqlParameter("@vatvalues", myData.totalvaluesVat));
	cmd.Parameters.Add(new SqlParameter("@nrofarticles", myData.nrofarticles));
	cmd.Parameters.Add(new SqlParameter("@user", myData.user));
	cmd.Parameters.Add(new SqlParameter("@time", DateTime.Now));
	cmd.Parameters.Add(new SqlParameter("@barcode", myData.barcode));
	cmd.Parameters.Add(new SqlParameter("@name", myData.name));
	cmd.Parameters.Add(new SqlParameter("@qty", myData.qty));
	cmd.Parameters.Add(new SqlParameter("@vat", myData.vat));
	cmd.Parameters.Add(new SqlParameter("@price", myData.price));
	cmd.Parameters.Add(new SqlParameter("@totalpcs", myData.totalprice));
	cmd.Parameters.Add(new SqlParameter("@valuewithoutvatpcs", myData.valuewithoutvat));
	cmd.Parameters.Add(new SqlParameter("@vatvaluepcs", myData.valuevatpcs));

	cmd.ExecuteNonQuery();
}

And the list declared on the Program.Cs

{
	static class Program
	{
	/// <summary>
	/// The main entry point for the application.
	/// </summary>
	[STAThread]
	static void Main()
	{
		Application.EnableVisualStyles();
		Application.SetCompatibleTextRenderingDefault(false);
		Application.Run(new Form1());
	}

	public static List<arka_data> dta;

}

I put a breakpoint on the line of void method mbushe : Program.dta.Add(ad), after the error is thrown , I checked the breakpoint there are no collected data just null value like:0.0, null etc attachec the image
So I think something is wrong with the void method mbushe.
But this code, thrown me an error " Procedure or function expects parameter , which was not supplied.This error is showed for each paramater of this code ( that means the data collected from class are null). So my question is what should i change on void method or class to collect data properly ?Could someone help me what to change in the code ?

What I have tried:

void mbushe(object sender, EventArgs e)
{
   pos_data ad = new pos_data();

   for (int i = 0; i < dataTable.Rows.Count; i++)
   {
      ad.NR = int.Parse(txtnrfatures.Text);
      ad.totalvaluesVAT = float.Parse(textBox1.Text);
      ad.barcode= int.Parse(dataTable.Rows[i][0].ToString());
      ad.name= dataTable.Rows[i][1].ToString();
      ad.qty= int.Parse(dataTable.Rows[i][2].ToString());
      ad.price= int.Parse(dataTable.Rows[i][3].ToString());
      ad.vat = int.Parse(dataTable.Rows[i][4].ToString());
      ad.subtotal = float.Parse(txttotali.Text);
      ad.discount= float.Parse(txtzbritja.Text);
      ad.total= float.Parse(totali.Text);
      ad.date= DateTime.Now;
      ad.user = lbluser.Text;
      ad.client= cmbklienti.Text;
      ad.valuevatpcs = float.Parse(dataTable.Rows[i][7].ToString());
      ad.valuewithoutvat= float.Parse(dataTable.Rows[i][6].ToString());
      ad.nrofarticles= int.Parse(lblnumri.Text);
      ad.totalprice = float.Parse(dataTable.Rows[i][5].ToString());

      Program.dta.Add(ad);
}

dta is an static list declared on Program.cs