How to check whether the maskedTextBox has a valid date format

Question

Hello, Can anybody help me please how to check whether the entered date in the maskedTextBox is a valid date/has correct date format? Thanks in advance.

Vulpes · Answer

I thought I'd just try the nullable type idea myself but it didn't work. However, as long as 'datp' and 'com' are fields, this should work: private void maskedTextBox1_TypeValidationCompleted(object sender, TypeValidationEventArgs e) { if (e.IsValidInput) { datp = (DateTime)e.ReturnValue; com.Parameters.Add("@Data_otstran_rekl", OleDbType.Date).Value = datp; } else if (maskedTextBox1.Text == " . .") { com.Parameters.AddWithValue("@Data_otstran_rekl", DBNull.Value); } else { MessageBox.Show("Not a valid date"); maskedTextBox1.Focus(); } }

Nel · Answer

Thank you Vulpes

Vulpes · Answer

Just a wild guess but does it permit an empty mask if you set the ValidatingType property to a nullable DateTime rather than an ordinary DateTime i.e: typeof(DateTime?)

Nel · Answer

Thank you to both of you. Vulpes now the validation is OK, but I also want to allo the maskedTextBox to be left empty.I have this code for click even in insert button: if (maskedTextBox1.Text != " . .") { datp = DateTime.Parse(maskedTextBox1.Text); com.Parameters.Add("@Data_otstran_rekl", OleDbType.Date).Value = datp; } else { com.Parameters.AddWithValue("@Data_otstran_rekl", DBNull.Value); } but because of the validation, this code can not be executed. Can you help me please how to achieve this? Thank you.

Vulpes · Answer

You can use the ValidatingType property in combination with the TypeValidationCompleted event to do this. Check out this MSDN link: http://msdn.microsoft.com/en-us/library/system.windows.forms.maskedtextbox.validatingtype.aspx

Prime b · Answer

Yes you can, you can do anything, this is programming. Also what time format do you need? Year: YYYY (eg 1997) Year and month: YYYY-MM (eg 1997-07) Complete date: YYYY-MM-DD (eg 1997-07-16) Complete date plus hours and minutes: YYYY-MM-DDThh:mmTZD (eg 1997-07-16T19:20+01:00) Complete date plus hours, minutes and seconds: YYYY-MM-DDThh:mm:ssTZD (eg 1997-07-16T19:20:30+01:00) Complete date plus hours, minutes, seconds and a decimal fraction of a second YYYY-MM-DDThh:mm:ss.sTZD (eg 1997-07-16T19:20:30.45+01:00)

How to check whether the maskedTextBox has a valid date format

Answers (6)