It's simply StructName.strPropGetter = "A STRING";
edit
If you mean how should you implement strPropGetter, then this is difficult wihout any information on what strPropGetter is. But it may be something like:
class StructName
{
string strPropGetter { get; set; }
}
StructName.strPropGetter = "A STRING";
(This is a literal copy of the names to make it easier to see how it relates to the original snippet of code, but obviously "strPropGetter" etc should be named something more sensible. The "Getter" in the original name possibly refers to a "get" mehod for a property, in which case, this is generated automatically by C# for the "get;" part of the property in the code above.
I can't really help much more without a better idea of what code you're looking at wrapping/converting.