I have a string, and I want let the first character capitalize. How to do it?

[fAnSKyer/C# newbie]

Sorry for this stupid question.
I am using c way s[0] = s[0] -'a' +'A'

but I can't compile it.

Thanks for your kind help
Best wishes

 

[Marc Gravell]

Strings are immutable; you cannot update them. And character
arithmetic isn't very culture safe.

You either need to take the two substrings and use ToUpper() on the
first portion (character), then concatenate, or (depdning on usage)
you might look at TextInfo.ToTitleCase().

Marc

 

[Ben Voigt]

Sorry for this stupid question.
I am using c way s[0] = s[0] -'a' +'A'

but I can't compile it.

Use a StringBuilder instead.

 

[Glenn]

http://msdn2.microsoft.com/en-us/library/system.globalization.textinfo.aspx

 

[Jon Skeet [C# MVP]]

Sorry for this stupid question.
I am using c way s[0] = s[0] -'a' +'A'

but I can't compile it.

Use a StringBuilder instead.

There's no point in using a StringBuilder here:

s = char.ToUpper(s[0])+s.Substring(1);

Okay, there's a box involved, but there won't be any wasted space
(easily avoided with StringBuilder, admittedly), and you won't be
creating a StringBuilder object.

 

[fAnSKyer/C# newbie]

Very cool method, works fine. Thanks a lot and all the other fellows

Sorry for this stupid question.
I am using c way s[0] = s[0] -'a' +'A'
but I can't compile it.

Use a StringBuilder instead.

There's no point in using a StringBuilder here:

s = char.ToUpper(s[0])+s.Substring(1);

Okay, there's a box involved, but there won't be any wasted space
(easily avoided with StringBuilder, admittedly), and you won't be
creating a StringBuilder object.