Question Best approach to checking conditions before loading a form.

[meisenstein]

Hi All

Hoping someone can point me in the right direction here. Using VB.Net.

I have a form which asks for a username and password to connect to a MySQL database. Before I load the login form I would like to place a check to see if the connection information is stored in the My.Settings.<connection string>

I am using Sub New() in the Form.Designer to do this by placing the following code:

If My.Settings.cs_Server = "" Or My.Settings.cs_Database = "" then

Application.Run(frmConnectionInformation)

else

InitializeComponent()

End If

The connection form does show but when i close the form there is a blank form that shows up. Why does this happen?

Am I approaching this in the correct way or is there a better or preferred way of doing this. Any help would be greatly appreciated.

 

[JohnH]

InitializeComponent must be called, this is where designer puts all generated code to set up the form.
I'd call frmConnectionInformation.ShowDialog and not App.Run because message loop is already started.

 

[meisenstein]

Hi JohnH

Thank you for the reply.

This is the code i have in place:

Sub New()

If My.Settings.cs_Server = "" Then

frmConnectionInformation.ShowDialog()

Else

InitializeComponent()

End If

End Sub

However when i close the connection form for some reason it pops up a blank form which i then need to close in order to close the application.

This is when i close the form without doing anything.

 

[JohnH]

This is because you never call InitializaComponent.