Pangram checker

You are encouraged to solve this task according to the task description, using any language you may know.
A pangram is a sentence that contains all the letters of the English alphabet at least once.

For example:   The quick brown fox jumps over the lazy dog.



Task

Write a function or method to check a sentence to see if it is a   pangram   (or not)   and show its use.



Related tasks

   determine if a string has all the same characters
   determine if a string has all unique characters


'Returns 0 if the string is NOT a pangram or >0 if it IS a pangram
string$ = "The quick brown fox jumps over the lazy dog."
 
Print isPangram(string$)
 
Function isPangram(string$)
    string$ = Lower$(string$)
    For i = Asc("a") To Asc("z")
        isPangram = Instr(string$, chr$(i))
        If isPangram = 0 Then Exit Function
    Next i
End Function