I'm new to coding. Using C#. In the code image below, I'm getting an error and I don't know how to fix it. I've got it declared and I used it on line 37 where I gave it a value. fatGram_Rate is a constant double in the class. (line 21)

Please help if you can. Thank you.

- Fat_Percentage_Calculator.MainForm - . calculateButton Click(object sender, EventArgs e) Fat Percentage Calculator // Class constant field. const double fatGram_Rate = 9; 1 reference public MainForm) InitializeComponent(); // Calculte button click event handler 1 reference private void calculateButton_Click(object sender, EventArgs e) double fatGrams, totalCalories, caloriesFromFat, percentCaloriesFromFat; if (double.TryParse(caloriesFromFatTextBox.Text, out fatGrams) && fatGrams > 0 && fatGrams 0 && totalcalories