How can I display a letter grade in my gridview after calculating percentage into a hidden field in Visual Studio?

Question

For school I am working on an app using C# in visual studio that allows a student to enter their name, the number of points they earned and the points possible. When they click a submit button, the grade percentage is calculated in a hidden field and then
the percentage and letter grade should spit out into the gridview. THe issue I am having is trying to figure out how to translate within the if statements regarding the percentage amount equalling whatever letter grade, and then spit that letter grade out
into the gridview. Here is the code I have so far:
        protected void btnSubmit_Click(object sender, EventArgs e)
            SqlStudent.Insert();
            hdnGradePercent.Value = (((int.Parse("txtPointsEarned.Text")) / (int.Parse("txt.PointsPoss.Text")) * 100)).ToString();
            if ((int.Parse(hdnGradePercent.Value) >= 0) & ((int.Parse(hdnGradePercent.Value) <= 59)))
(this is where I am having trouble. I can't figure out how to get the letter grade and percent to spit out into the   gridview.)
            else if ((int.Parse(hdnGradePercent.Value) >= 60) & ((int.Parse(hdnGradePercent.Value) <= 69)))
            else if ((int.Parse(hdnGradePercent.Value) >= 70) & ((int.Parse(hdnGradePercent.Value) <= 79)))
            else if ((int.Parse(hdnGradePercent.Value) >= 80) & ((int.Parse(hdnGradePercent.Value) <= 89)))
            else if ((int.Parse(hdnGradePercent.Value) >= 90) & ((int.Parse(hdnGradePercent.Value) <= 100)))
Any help would be greatly appreciated! I've been stuck on this for hours and I"m losing my mind!!

Answer 1

Please post ASP.NET questions in the ASP.NET forums (http://forums.asp.net ).