Passing the value from Form to Class using X++ in AX

First create a form  Test form with a table called Test table where we will have field(Name) over there and one grid in design and one button over there. 

Then create a new class and named it as TestClass

public static void main(Args args)
{

TestTable   testTable;

If(args.record().TableId == tablenum(TestTable))

{

testTable = args.record();

info(strFmt("%1", testTable.Name));

}
}

Create a new menu item named TestMenu with action type and assign the TestClass to that. 

Then write the click method of that button as 

void clicked()

{

    //super();

    MenuFunction    mf;

    args            args = new Args();

    ;

    args.record(TestTable);

    mf = new menufunction(identifierstr(TestMenu), MenuItemType::Action);

    mf.run(args);

}

now open the form and insert a record and click the button you will get output