How to refresh DataSource in DataGridView

Dim dt1 as DataTable = GetData("SELECT * FROM CLAIMSTATE ") 'return DataTable
dataGrid.DataSource = dt1
'On Event RowLeave I Insert or Update table from database
Private Sub dataGrid_RowLeave(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dataGrid.RowLeave
Dim row As DataGridViewRow = CType(sender, DataGridView).Rows(e.RowIndex)
  Dim query As New StringBuilder("")
  If row.Cells(0).Value & "" = "" Then
    query.Append("INSERT INTO CLAIMSTATE ")
    query.Append("(CST_CODE, CST_LABEL, CST_POINTS)")
    query.Append("VALUES ")
    query.Append("(?, ?, ?)")
  Else
    query.Append("Update CLAIMSTATE ")
    query.Append("SET CST_CODE = ?, ")
    query.Append("CST_LABEL = ?, ")
    query.Append("CST_POINTS = ? ")
    query.Append("WHERE CST_ID = ? ")
  End If
  Dim command As New OdbcCommand(query.ToString(), con)
  command.Parameters.Add("@cst_code", OdbcType.Char).Value = row.Cells(1).Value
  command.Parameters.Add("@cst_label", OdbcType.NVarChar).Value = row.Cells(2).Value
  command.Parameters.Add("@cst_points", OdbcType.Decimal).Value = row.Cells(3).Value
  command.Parameters.Add("@cst_id", OdbcType.BigInt).Value = row.Cells(0).Value

  Dim res As Integer = ExecuteNonQuery(command)

  dt1 = GetData("SELECT * FROM CLAIMSTATE ")
  'at this record I obtain this error: "operation cannot be performed in this event handler"
  dataGrid.DataSource = dt1
End Sub

dataGrid.Enabled = False
dataGrid.DataSource = Null
dataGrid.Enabled = False

BeginInvoke(new Action(delegate { dataGrid.DataSource = dt1; }));