The latest .net framework 4.5 provides a method Normalize() in Vector class.
http://msdn.microsoft.com/en-us/library/system.windows.vector.normalize.aspx[
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Have a look on the above link. There is a nice article which explains many things about vectors and vector normalization.
A Vector Type for C#[
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If you really want a method Normalize in the previous frameworks, then use the above link, understand it and create an extension method Normalize().
public static void Normalize(this Vector vectorObj,...)
{
}
I hope you were looking for the same.