DataGridView Row count Always show 1 when I try to write the value from threadclass/Delegate

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Windows

C#3.5

application

I have to write values to datagridview Column 2 which is in Form2(Form2 called in Mainform).

but I to want fill coloum2 rows from thread(required).
I have used delegate to avoid cross thread operation

but the datagridview1 rows count is always 1 in threadclass and on form2 it shows right count.
why datagridview1 shows one count always.

I don't know where the problem is

// Form 2 is called in MainForm

Form2
In form 2 there is button which is used to dynamicaly add rows in gridview

Datagridview1.Rows.Add(Convert.ToInt32(textbox1.Text));

// and I fill Sr.no colum by following code e.g 1,2,3

for (int i = 0, j = 1; i <=  Datagridview1.RowCount-1 ; j++, i++)
               {

                   Datagridview1.Rows[i].Cells[0].Value = (j).ToString();
               }
               //this is done to handle error; bool variable 

Form2HandleCreated= true;</pre>
ThreadClass

My thread class objects starts in InitialStartup Form

//this delegate is used to write values to datagrivew which is in form2
public delegate void Del_WriteValueToGridView(int count, string Value);

if (Form2HandleCreated== true)
                   {
                     for (int i = 0; i <= 10; i++)
                      {
                         SR = i;
                         Value= i.ToString();

                          Program.Form2Obj.TopLevel = true;
                          Program.MainFormObj.Labe11.Invoke(new Del_WriteValueToGridView(WriteToGridView), SR, Value);
                            if (i > 10) ;
                            Form2HandleCreated = false;
                        }

void WriteToGridView(int count,string Value)
      {
         //this count is always 1.Why?
          int n= Program.Form2Obj.DataGridView1.Rows.Count;
          Program.Form2Obj.DataGridView1.Rows[count].Cells[1].Value = Value;
      }