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copied!<p>You cannot limit the user only put in a-z chars on the console - you have to check the input, he can write in any character (just think about when the input is redirected to your program from a file with <, e.g. yourapp.exe < input.dat ). </p> <p>But its easy to check a character is lowercase a-z letter. E.g. with plain, ASCII, C tactic (I will use your defined variables):</p> <pre><code>if('A' <= pre3 && pre3 <'Z') { // pre3 was made upper in your code // input OK } else { // input NOK } </code></pre> <p>With regex:</p> <pre><code>Regex r = new Regex(@"^[a-zA-Z]$"); return r.IsMatch(pre); </code></pre> <p>If you cannot allow case-insensitive characters, just change the code I wrote.</p> <p>Anyway, I think you need Console.Read() (ReadKey also read keys like arrows, F1-F12 etc..., so ALL keys, even tab and caps lock). Refer to MSDN: <a href="http://msdn.microsoft.com/en-us/library/system.console.read.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.console.read.aspx</a></p> <p>And maybe you should use this function, if you would support unicode letters: <a href="http://msdn.microsoft.com/en-us/library/yyxz6h5w.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/yyxz6h5w.aspx</a> Note that unicode letters are usually not one bytes! But char can store it. These letters are for example beautiful Hungarian letters with acutes and these king of things: á, é, ő, ű, ö, ü etc (but also French have a lot, and also Dutch etc...)</p>

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