When using a numeric format specifier such as N, F, or C in an interpolated string, it is possible to specify the number of digits to display after a decimal point.

In the following statement, the value of the number variable will be rounded to four decimal places.string message = String.Format(“The number is: {0,4:N2}”, number);

You can use a subscript expression such as name[3] = ‘A’ to change the value of a character within a string.

A mathematical expression, such as A * B, cannot be passed as an argument to a method containing a reference parameter.

Because char variables can hold only one character, they are not assignment-compatible with string variables.

Assume amount is a decimal variable that has been assigned a value. The following interpolated string formats the value of the amount variable as currency:$”The amount is {amount:Curr}”;

A direct access file is also known as a random access file.

When the WriteLine method writes data to a file, it writes a null character immediately following the data.

A well-designed program should validate the contents of multiple TextBoxes in a single statement.

If the expression on the left side of the || operator is true, the expression on the right side is not checked.