want to return a value using void method

void methods to not return values, however you can return changed values with ref or out:

void method1(string p1, ref int i)
{
   i = 10; // will be changed for the caller 
}

void method2(string p1, out int j)
{
   j = 20; // you must set an 'out' parameter or the compiler will complain
}

http://www.dotnetperls.com/out[^]
http://www.dotnetperls.com/ref[^]

I'm afraid that voids cannot return anything, hence why they are called 'voids' - 'void' is a fancy word that means 'nothing' or 'empty' in English.

You can always try using an out, like this:

string test = "Starting Value"
Console.WriteLine(test); //output: Starting Value
Modify(out test);
Console.WriteLine(test); //output: Modified Value

And the void Modify is defined like this:

void Modify(out string input)
{
   input = "Modified Value";
}