[英]validating textbox one and textbox two or leave it empty
我如何驗證 textbox1 和 textbox 2。
- 波紋管代碼是我驗證日期是否大於或不大於的地方
Private Sub cvCmpDate_ServerValidate(ByVal source As Object, ByVal args As ServerValidateEventArgs) Handles cvCmpDate.ServerValidate
If CompareMyDate.CompareDate(txtDateStart.Text.Trim, txtDateEnd.Text.Trim) Then
cvCmpDate.ErrorMessage = "* Activation Start Date cannot greater than Activation End Date."
args.IsValid = False
End If
End Sub
Select Case True
Case String.IsNullOrWhitespace(txtDateStart.Text) AndAlso Not String.IsNullOrWhitespace(txtDateEnd.Text)
' Show Error
Case String.IsNullOrWhitespace(txtDateEnd.Text) AndAlso Not String.IsNullOrWhitespace(txtDateStart.Text)
' Show Error
Case CompareMyDate.CompareDate(txtDateStart.Text.Trim, txtDateEnd.Text.Trim)
cvCmpDate.ErrorMessage = "* Activation Start Date cannot greater than Activation End Date."
args.IsValid = False
End Select
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