Initial data commit

Task/Call-a-function/C-sharp/call-a-function.cs

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+/* a function that has no argument */
+	public int MyFunction();
+
+	/* a function with a fixed number of arguments */
+	FunctionWithArguments(4, 3, 2);
+
+	/* a function with optional arguments */
+	public void OptArg();
+
+	public static void Main()
+	{
+		OptArg(1);
+		OptArg(1, 2);
+		OptArg(1, 2, 3);
+	}
+	public void ExampleMethod(int required,
+        string optionalstr = "default string",
+		int optionalint = 10)
+	/* If you know the first and the last parameter */
+	ExampleMethod(3, optionalint: 4);
+
+	/* If you know all the parameter */
+	ExampleMethod(3, "Hello World", 4);
+
+	/* Variable number of arguments use array */
+	public static void UseVariableParameters(params int[] list)
+
+	/* Obtain return value from function */
+	public internal MyFunction();
+	int returnValue = MyFunction();