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ผมก็นึกว่าดึงมาจากฐานข้อมูลก่อนครับ ... เพิ่ม Control เข้าไปดังนี้ ... 
TextBox = txtProjectName 
DateTimePicker = dtpDeadline 
Button = btnAddRow 
Button = btnRemoveRow 
- Public Class frmCountDownGrid
 
  
-     Private Sub frmCountDownGrid_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
 
 -         With DataGridView1
 
 -             '// Autosize Column
 
 -             .AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill
 
 -             .AllowUserToAddRows = False
 
 -             .SelectionMode = DataGridViewSelectionMode.FullRowSelect
 
 -         End With
 
 -         With DataGridView1
 
 -             .ColumnCount = 3
 
 -             .Columns(0).Name = "Project Name"
 
 -             .Columns(1).Name = "Deadline"
 
 -             .Columns(2).Name = "Countdown"
 
 -             '.Rows.Add({"Project 1", "23/05/2564 00:00:00", ""})
 
 -             '.Rows.Add({"Project 2", "01/06/2565 00:00:00", ""})
 
 -         End With
 
 -         Timer1.Interval = 1000
 
 -         Timer1.Enabled = True
 
 -         '//
 
 -         txtProjectName.Clear()
 
 -         dtpDeadline.Format = DateTimePickerFormat.Custom
 
 -         dtpDeadline.CustomFormat = "dd MMMM yyyy hh:mm"
 
 -         dtpDeadline.Value = Now()
 
 -     End Sub
 
  
-     Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
 
 -         For row As Integer = 0 To DataGridView1.Rows.Count - 1
 
 -             Dim StartDate As Date = DataGridView1.Rows(row).Cells(1).Value
 
 -             Dim EndDate As Date = Date.Now
 
 -             Dim TimeSpan As TimeSpan = StartDate.Subtract(EndDate)
 
 -             Dim DifDays As Integer = TimeSpan.Days
 
 -             Dim DifHr As Integer = TimeSpan.Hours
 
 -             Dim DifMin As Integer = TimeSpan.Minutes
 
 -             DataGridView1.Rows(row).Cells(2).Value = DifDays & " วัน, " & DifHr & " ชั่วโมง, " & DifMin & " นาที."
 
 -         Next
 
 -     End Sub
 
  
-     Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles btnAddRow.Click
 
 -         If txtProjectName.Text.Trim.Length = 0 Then
 
 -             MessageBox.Show("กรุณาป้อนชื่อโปรเจค")
 
 -             txtProjectName.Focus()
 
 -             Exit Sub
 
 -         End If
 
 -         Call AddRow()
 
 -     End Sub
 
  
-     Private Sub AddRow()
 
 -         Dim row As String()
 
 -         row = New String() {txtProjectName.Text, dtpDeadline.Value}
 
 -         DataGridView1.Rows.Add(row)
 
 -         '//
 
 -         txtProjectName.Clear()
 
 -         dtpDeadline.Value = Now()
 
 -         txtProjectName.Focus()
 
 -     End Sub
 
  
-     Private Sub RemoveRow()
 
 -         '// Delete current row from DataGridView1
 
 -         If DataGridView1.RowCount = 0 Then Exit Sub
 
 -         DataGridView1.Rows.Remove(DataGridView1.CurrentRow)
 
 -     End Sub
 
  
-     Private Sub btnRemove_Click(sender As System.Object, e As System.EventArgs) Handles btnRemoveRow.Click
 
 -         Call RemoveRow()
 
 -     End Sub
 
 - End Class
 
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