methods - C# Optional parameters / multiple required -

is possible requirement 2 optional parameters together? here's example:

public void paramchoise(string a, bool b = false, string c = "y")     {         // stuff here     } 

where b optional, want function require c if b true. logic that:

public void paramchoise(string a, (bool b = false, string c = "y")) 

couldnt find googling. 1 possible way me be:

        /// <summary>         /// if want behaviour xxx enabled, please enter "c" usage.         /// </summary>         /// <param name="a"></param>         /// <param name="c"></param>         public void paramchoise(string a, string c = "y")         {             // stuff here         } 

for sure give function comment this, writing comment unlogical given parameter feels bad me.

this case maybe bad example im sure i'll run again in future.

thanks :).

edit clear things:
possible combination parameters:

• a only
• a & (b & c)
• not & b
• not & c (because b gives point if c needed)

i think need old way - method overloading.

// b = true public void paramchoise(string a, string c)  // b = false public void paramchoise(string a) 

they should call private version of original

private void paramchoiseinternal(string a, bool b = false, string c = "") 

you should ensure you're giving 2 public methods name accurately conveys meaning - programmer (probably you, know) call right method current state.

---

after update

same above, names reflect requirement, , should still able call original private method. overloads ensure consistency

public void aonly(string a) public void aandbandc(string a, bool b, string c) 

struggling decipher these 2:

not & b without c !!!
not , c (because b gives point if c needed)