label text need't to update

Question

Hi all

i made a doubleclick event in a dataGridView, all i need to when i double click on row save the data in the row to a global List declered in a class file, and then change some labels text in another form depend on this List.

But what happens with me all thing is right after i make the 1st double click and close the 2nd form (that contans the labels) after i open the 2nd form again and do double click in the 1st form nothing happens, but when i do many clicks it works.

 

the code of the celldoubleclick:

private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
       {
           GlobalVariables.CustomerInfoList.Add(dataGridView1.Rows[dataGridView1.SelectedRows[0].Index].Cells[0].Value.ToString());
           GlobalVariables.CustomerInfoList.Add(dataGridView1.Rows[dataGridView1.SelectedRows[0].Index].Cells[1].Value.ToString());
           GlobalVariables.CustomerInfoList.Add(dataGridView1.Rows[dataGridView1.SelectedRows[0].Index].Cells[2].Value.ToString());
           GlobalVariables.CustomerInfoList.Add(dataGridView1.Rows[dataGridView1.SelectedRows[0].Index].Cells[3].Value.ToString());
           GlobalVariables.CustomerInfoList.Add(dataGridView1.Rows[dataGridView1.SelectedRows[0].Index].Cells[7].Value.ToString());
       }

 the code of global variables

 

class GlobalVariables
   {

       public static string connectionString;
       public static string user = "User";
       public static string placeName = "";
       public static string permissions = "";
       public static List<string> CustomerInfoList = new List<string>();
   }

the code of 2nd form happens in timer

 

private void timer1_Tick(object sender, EventArgs e)
       {
           if (GlobalVariables.CustomerInfoList.Count != 0)
           {
               customerIdNumberLabel.Text = GlobalVariables.CustomerInfoList[0];
               customerNameTB.Text = GlobalVariables.CustomerInfoList[1] + " " + GlobalVariables.CustomerInfoList[2] + " " + GlobalVariables.CustomerInfoList[3];
               mobileTB.Text = GlobalVariables.CustomerInfoList[4];
               customerIdNumberLabel.Visible = true;
               GlobalVariables.CustomerInfoList.Clear();
           }
       }