主题：值为空

If dr Is Nothing Then Return

If dr("状态")="跟进中"

Dim d As Date = cdate(dr("记录日期")).adddays(val(e.Form.Controls("TextBox6").text)) 

Dim dt As Date =  format(d,"yyyy-MM-dd 23:59:59")

Dim t As TimeSpan = dt - Date.Today     '计算现在离今天的24时整还差多少时间

e.Form.Controls("Label29").Text = "剩余" & t.Days & "天" & t.Hours & "小时" & t.Minutes & "分" & t.Seconds & "秒"

Dim Lbl As WinForm.Label = e.Form.Controls("Label29")

If Lbl.ForeColor = Color.Red Then

    Lbl.ForeColor = Color.Black

Else

    Lbl.ForeColor = Color.Red

End If

Else

e.Form.Controls("Label29").text =""

End If