C# becoming proficient

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I have been working with Delphi since its inception (10+ years but only
up to v5) and am now tackling C#.
I find it immense in depth with an enormous amount to learn.
This is just a comment but i would like to know how long it has taken
some of you obviously proficient programmers to get up to speed.
I read 4 C# books and am now converting a rather complex delhi project
to C# and can see the advantages of it (it is a must do as client says
cannot use delphi.net).

Main question is do others also find C# challenging (or am i
experiencing ealy onset alzeimer).

rgds,Steve


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