troubleshooting Question

An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll

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the student asked on
Visual Basic.NETC#
5 Comments1 Solution264 ViewsLast Modified:
private void TxtMarks1030_TextChanged(object sender, EventArgs e)
        {

            Int32 marks1030 = Convert.ToInt32(TxtMarks1030.Text);

            if (marks1030 >= 101)
            {
                LblGrade1030.Text = "Please enter less than 100";
            }
            else if (marks1030 >= 90)
            {
                LblGrade1030.Text = "A";
            }
            else if (marks1030 >= 80)
            {
                LblGrade1030.Text = "B";
            }
            else if (marks1030 >= 65)
            {
                LblGrade1030.Text = "C";
            }
            else if (marks1030 >= 50)
            {
                LblGrade1030.Text = "D";
            }
            else if (marks1030 >= 40)
            {
                LblGrade1030.Text = "E";
            }
            else
            {
                LblGrade1030.Text = "Fail";
            }
        }
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