Question

How can I make insuranceCost available outside the if statement?

if (this.comboBox5.Text == "Third Party Fire and Theft")
{
    double insuranceCost = 1;
}

Answer 1

Define it outside of the if statement.

double insuranceCost;
if (this.comboBox5.Text == "Third Party Fire and Theft")
        {
          insuranceCost = 1;
        }

If you are returning it from the method then you can assign it a default value or 0, otherwise you may get an error, “Use of unassigned variable”;

double insuranceCost = 0;

or

double insuranceCost = default(double); // which is 0.0