Regarding boolean type variable

[Ahamed Azeem]

When i use below code, it returns true and then i changed the condition to check m=1 then its returns false. I am little confused about booleans so please let me know the internal implementation about boolean. Dim m As Boolean = 1 If m = -1 Then MsgBox("true") Else MsgBox("false") End If I know that using "True" or "False" is best practise but for better understanding i need this Thanks in advance Regards Azeem

[Ashfield]

A boolean can be either true or false. Best practice is not to use 1, -1,0 etc but use true and false as the actual values can be operating system dependant.

Bob Ashfield Consultants Ltd Proud to be a 2009 Code Project MVP

[Ray Cassick]

Once you set the Boolean = to 1 are you sure that it is staying at the value of 1 and not being altered to equal how VB internally stores a true or false value? Why do you want to create a Boolean then assign it a number and compare it to a number?

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[Ray Cassick]

Trying to locate a link that shows you why this happens, but what you are seeing is type conversion related. VB.NET stores false as a 0 and any other value as true, but that defaults to being stored as = -1. So, when you assign the Boolean = 1 it gets converted internally to -1 because it is not a false value (0). Try doing a few debug.prints and setting the Boolean to a few values and see what happens. It looks to me like you do not have option strict turned on. If not, you should because it forces your code to be far more explicit and not allow type coercion (dynamic type conversion) like this.

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[Lost User]

0 = nothing = false, the rest is always true :) A more proper boolean;

enum MyBool = {
true,
false,
EFileNotFound}

I are troll :)