Write a statement that assigns the number 2.5 to the dblNum variable.

Write a statement that displays the value of a char variable named letterGrade in a message box.

Using C# in a visual studio form, Create an application. Add  a label and a button to the form. The button’s Click event procedure should add the  number 1 to the contents of a class-level Integer variable named intNumber and then  display the variable’s contents in the label. Code the application. Be sure to enter the  three Option statements above the Public Class clause. Save the solution and then start  and test the application. Next, change the class-level variable to a static variable.