Comments by Aria Jafarian (Top 21 by date)

All the code you have written is in Login button click.
Put a break point and see what is in your form load GlobalVariable.IsAdmin

Where you check if your user is an Admin or Employee just add this
GlobalVariables.IsAdmin = True (obviously this is when your user is Admin)

I just added it for you in your code:
If dr.GetString(2) = "ADMIN" Then
GlobalVariables.IsAdmin = True
Me.Hide()
HomePage.Show()
ElseIf dr.GetString(2) = "EMPLOYEE" Then
GlobalVariables.IsAdmin = False
Me.Hide()
HomePage.Show()


and add this class to your project
Public Class GlobalVariables
Public Shared Property IsAdmin As bool
End Class

Then everywhere in your application you have access to GlobalVariables.IsAdmin

Check the solution for Global variables below.

Hi, What error do you get?
Put a breakpoint on the first line of code above(button click) and follow the debugger.
Just noticed, you don't need brackets in the commandText for your table name.
Take them out. cmd.CommandText = "select * from booking where BookingId = @BookingId";

I didn't understand the question? Is it asp.net or native Android?
And as stated by Sinisa write the code and ask us for ideas.

We are not talking about a guaranty,it is about the probability.
Each time you buy a lottery ticket the odds are the same never changes.(given the number of tickets sold are the same)
That's why we say unlikely.If odds for something is 1 in trillion there is no guaranty of that not happening but the probability is soooo small.

Where did I say that the Guid is 100% unique?
I reiterate a colllision is highly unlikely.

Yes poisoning the well falacy. Start generating Guids and show me a collision. I presented Eric Lippert's research you don't want to believe it show us how you got a collision.
Bear in mind the language you used is the sheer example of anti science bias.

Eric Lippert :

There are on the order 230 personal computers in the world (and of course lots of hand-held devices or non-PC computing devices that have more or less the same levels of computing power, but lets ignore those). Let's assume that we put all those PCs in the world to the task of generating GUIDs; if each one can generate, say, 220 GUIDs per second then after only about 272 seconds -- one hundred and fifty trillion years -- you'll have a very high chance of generating a collision with your specific GUID. And the odds of collision get pretty good after only thirty trillion years.

What kind of language is this?
The burdan of proof is on you, if you understand the concept.
Do you understand that the time stamp with the date is unique? And certainly I said it is unlikely.

Yes you can check for uniqueness yourself but haven't seen a collision reported in GUIDs. There was a discussion on stack and in a nutshell it is highly unlikely to see a collision because the time stamp is used in the generation of a GUID.

Improved the answer.