Update Datagridview From Another Form

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C#

WinForms

DataGridView

i did like this: (i have datagridview in Form1)

Form1:

public void FillDataGridView(DataTable dt1)
  {
//dt1 is datatable
          bindingSource1.DataSource = dt1;
          bindingSource1.ResetBindings(false);
          dataGridView1.DataSource = bindingSource1;
          //here i checked number of rows of dt1 and it shows the correct value
  }

Form2:

  SqlConnection cnn = new SqlConnection(@"My connection string");
            private Form1 Handled_frm1;
            public Form2(Form1 frm1)
            {
                    InitializeComponent();

                Handled_frm1 = frm1;
            }

               private void textbox1_TextChanged(object sender, EventArgs e)
                     {
                        dt.Clear();
                        using (SqlCommand cmd =cnn.CreateCommand())
                        {
                            if (cnn.State == ConnectionState.Closed)
                            {
                                cnn.Open();
                            }
                            cmd.CommandType = CommandType.StoredProcedure;
                            cmd.Connection = cnn;
                            cmd.CommandText = "spSearchCustomerByName";
                        SqlParameter inparam1=cmd.Parameters.AddWithValue("@name", textbox1.Text);
                            inparam1.Direction = ParameterDirection.Input;
                            dap.SelectCommand = cmd;
                            dap.Fill(dt);
//dt is datatable and dap is dataadapter
                            Handled_frm1.FillDataGridView(dt);
                        }

i dont get any error but datagridview rows does not change also when i checked count of rows where i commented,it shows the correct count!

Edited:

I wanted to test that if i can clear datagrid view or not,so i changed FillDataGridView like this :

public void FillDataGridView(DataTable dt1)
       {
               dt.Clear();
               dataGridView1.Columns.Clear();
               dataGridView1.DataSource = null;
               dataGridView1.Refresh();
       }

but it does not clear datagridview1!!!