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Why on earth would you want to put the same function in every class, what if you need to change it.<br />
<br />
DRY : <a href="http://en.wikipedia.org/wiki/Don't_repeat_yourself" rel="ugc">http://en.wikipedia.org/wiki/Don't_repeat_yourself</a>
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Why on earth would you want to put the same function in every class, what if you need to change it.

DRY : http://en.wikipedia.org/wiki/Don't_repeat_yourself [http://en.wikipedia.org/wiki/Don't_repeat_yourself]

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Okay I believe in having Utility classes. An approach you can take is creating your own framework project so it can be consumed within any of your tiers. For example<br />
<br />
Company.Framework<br />
Company.Application.Busine<wbr />ss --&gt; uses Company.Framework<br />
Company.Application.Data --&gt; uses Company.Framework<br />
Company.Application.Presen<wbr />tation --&gt; use Company.Framework<br />
<br />
Within your framework project you can different Utility classes that assist with different things for example serialization, data access, string manipulation, etc. Now it absolutely doesn't make sense for a class to have one method, that's not to say that a class cannot have one method if that's the only one that's relevant.<br />
<br />
Group related functions in the same class.
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Okay I believe in having Utility classes. An approach you can take is creating your own framework project so it can be consumed within any of your tiers. For example

Company.Framework
Company.Application.Business --> uses Company.Framework
Company.Application.Data --> uses Company.Framework
Company.Application.Presentation --> use Company.Framework

Within your framework project you can different Utility classes that assist with different things for example serialization, data access, string manipulation, etc. Now it absolutely doesn't make sense for a class to have one method, that's not to say that a class cannot have one method if that's the only one that's relevant.

Group related functions in the same class.

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Put connection string and some common function I use it in public class<br />
Like {GetLastID , FillGrid,&amp;}<br />
Or put every function in its class<br />
Note: I used N-tier (layer) at my work.<br />
Thanks for help<br />

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Put connection string and some common function I use it in public class
Like {GetLastID , FillGrid,&}
Or put every function in its class
Note: I used N-tier (layer) at my work.
Thanks for help


What is better in c#?

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).