C# - GetMethod returns null -

i have a class:

public abstract class {  } 

and have b class derives it:

public sealed class b : {     public void somemethod()     {         var method = this.gettype().getmethod("addtext");     }      private void addtext(string text)     {         ...     } } 

why getmethod returning null?

var methodinfo = this.gettype().getmethod("addtext", bindingflags.instance | bindingflags.nonpublic, null, new type[] { typeof(string) }, null); 

your method has parameter, need use overload accepts type array parameter types , binding flags.

in .net method signatures based on name, return type, , parameters.

so if method has parameters have tell reflection parameter types has via type[].