c# - Exception when calling methods from console -

i making console app thats gonna invoke methods strings, part ok when comes parameters need help

this code, static void main(string[]args)

                 //gets variable void/method                  string void_name = console.readline();                   //making type in case 'program'                  type type_ = typeof(program);                   //making route string 'void_name'                  methodinfo method_ = type_.getmethod(void_name);                   //getting optional parameters                   object[] obj = new object[] { "" };                  foreach (parameterinfo _parameterinfo in method_.getparameters())                   {                      obj[0] = console.readline();                  }                  foreach (string obj_string in obj)                  {                      console.writeline(obj_string);                  }                   //calling functions                  method_.invoke(type_, obj); <-- exception               }              catch (exception exception_loop)              {                   console.writeline(exception_loop.message);                  console.clear();              }          }      }      public void helloworld(string something_)      {         console.writeline("\theisann: " + something_);     } 

how method declaration this:

public static void helloworld(string something_) 

you calling static method.