gistfile1.cs

public class ClassMethodWalker : CSharpSyntaxWalker
{
    string className = String.Empty;
    public override void VisitClassDeclaration(ClassDeclarationSyntax node)
    {
        className = node.Identifier.ToString();
        base.VisitClassDeclaration(node);
    }

    public override void VisitMethodDeclaration(MethodDeclarationSyntax node)
    {
        string methodName = node.Identifier.ToString();
        Console.WriteLine(className + '.' + methodName);
        base.VisitMethodDeclaration(node);
    }
}

static void Main(string[] args)
{
    var tree = CSharpSyntaxTree.ParseText(@"
    public class MyClass
    {
        public void MyMethod()
        {
        }
    }
    public class MyOtherClass
    {
        public void MyMethod(int n)
        {
        }
    }
   ");

    var walker = new ClassMethodWalker();
    walker.Visit(tree.GetRoot());
}