5 replies to this topic

[Coder_Abdul]

i try to make this code

            if (pr_NumberTextBox.Text == "" || create_dateDateTimePicker.Text == "")

            {

                MessageBox.Show("Error");

            }

if pr_NumberTextBox == null then Error
or
create_dateTimePicker == null then Error

but

The problem is with dateTimePicker it does not become empty . Because of that there is a default value . i just ask if can i do it empty??

[gregwarner]

Try using the .IsNullOrEmpty() member function to test for a string being null. Like so:

create_dateDateTimePicker.Text.IsNullOrEmpty()

Let me know if that works.

[Coder_Abdul]

does not work ...

[Momerath]

DateTimePicker always has a value so there is no need to check if it has a value.

[Coder_Abdul]

i think , i will try to do another idea in this form ... I was just help my friends in their graduation project, the prison management system. i need to tell users error message when they click save button to save data if pr_number or create_date are empty.
I think ,, I'm going to bring many questions here.
Thank you gregwarner , Thank you Momerath ...

[Momerath]

gregwarner said:

Try using the .IsNullOrEmpty() member function to test for a string being null. Like so:

create_dateDateTimePicker.Text.IsNullOrEmpty()

IsNullOrEmpty is a static method (if the string was null, there wouldn't be anything to call :)). So it's used like:

if (String.IsNullOrEmpty(someStringValue)) { // it's null, or empty!