Form is closed when exception is not true

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Hello Guys, Here is the one problem very stupid problem am facing that is I want when data table is null so application will be closed and when data table is not null so it shows message box and return the form but when the data table is not null so form is closing I don't know what's the issue please check it and suggest me
Thanks

What I have tried:

if (dt44 ==null)
            {
                Application.Exit();
            }
            else
            {
                MessageBox.Show("Tables Are Open Login Again And punch Them", "Tables Open", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

Posted 9-Jul-17 2:59am

Member 9983063

Updated 9-Jul-17 3:15am

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Wendelius · Answer 1 · 2017-07-09T03:12:00

Using debugger, check that the data table dt44 is null. Chances are that is for example contains an empty data table or similar.

Another thing is that why not check the data table when the program starts, before you have created the form. This way you could decide whether to create the main form or not and you wouldn't have to worry about returning to the form. About main method, have a look at this conversation .c# - Where is the Main method in a forms application? - Stack Overflow[^]

RickZeeland · Answer 2 · 2017-07-09T03:15:00

Solution 2

You can use:

C#

if (dt44.Rows.Count <= 0)

Posted 9-Jul-17 3:15am

RickZeeland

Comments

Dave Kreskowiak 9-Jul-17 10:51am

If dt44 is null, this call is going to fail with an exception.

RickZeeland 9-Jul-17 11:56am

You are completely right, always test for null first !