Not able to convert string to int. Error msg: Input string was not in a correct format

Question

I have the following c# code which should output fee_paid_int as '20' and total_student_int as '30' how ever I am receiving the following error when I debug the code on int fee_paid_int = Convert.ToInt32(fee_paid_string.Trim());

System.FormatException: Input string was not in a correct format.

C#

//Total Student's - Not counting Graduated, Withdrawn or Temporarily Withdrawn
DataView t_stu = (DataView)total_students_count.Select(DataSourceSelectArguments.Empty);
    foreach (DataRowView t_stu_sql in t_stu)
    {
        total_students_count_label.Text = "Total Current Students: <b>" + t_stu_sql["total_students"].ToString() + "</b><p></p>";
    }

// Total Fee's Paid to Date
DataView f_paid = (DataView)fees_paid_count.Select(DataSourceSelectArguments.Empty);
    foreach (DataRowView fee_paid_sql in f_paid)
    {
        fees_paid_count_label.Text = "Total Fee's Paid to date: <b>" + fee_paid_sql["fee_paid"].ToString() + "</b><p></p>";
    }

int fee_paid_int = Convert.ToInt32(total_students_count_label.Text.Trim());
int total_student_int = Convert.ToInt32(fees_paid_count_label.Text.Trim());
int fee_paid_percent = (int)Math.Round((double)(100 * fee_paid_int) / total_student_int);
fee_paid_percent_label.Text = "Total Percent of Student's who have fully paid their Tution Fee to date " + fee_paid_percent + "%";

int fee_paid_percent should equal 66.66, any help would be greatly appreciated.

Nirman · Accepted Answer · 2015-11-25 05:35:22Z

1

total_students_count_label.Text = "Total Current Students: <b>" +
 t_stu_sql["total_students"].ToString() + "</b><p></p>";

The contents of this control cannot be converted to int because this contains non-numeric and non-integer contents..

you may need to revise this to change total_students_count_label.Text to contain only numbers - in your case... it should be

total_students_count_label.Text = t_stu_sql["total_students"].ToString();

answered Nov 25, 2015 at 5:35

Nirman

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Comments

Kaushik Maheta · Accepted Answer · 2015-11-25 05:31:23Z

0

Replace below line in your code.

//Total Student's - Not counting Graduated, Withdrawn or Temporarily Withdrawn
DataView t_stu =   (DataView)total_students_count.Select(DataSourceSelectArguments.Empty);
foreach (DataRowView t_stu_sql in t_stu)
{
    total_students_count_label.Text = t_stu_sql["total_students"].ToString();
}

  // Total Fee's Paid to Date
DataView f_paid = (DataView)fees_paid_count.Select(DataSourceSelectArguments.Empty);
foreach (DataRowView fee_paid_sql in f_paid)
{
    fees_paid_count_label.Text = fee_paid_sql["fee_paid"].ToString(); 
}

int fee_paid_int = Convert.ToInt32(total_students_count_label.Text.Trim());
int total_student_int = Convert.ToInt32(fees_paid_count_label.Text.Trim());
int fee_paid_percent = (int)Math.Round((double)(100 * fee_paid_int) /    total_student_int);
fee_paid_percent_label.Text = "Total Percent of Student's who have fully paid their Tution Fee to date " + fee_paid_percent + "%";

edited Nov 25, 2015 at 5:31

answered Nov 25, 2015 at 5:20

Kaushik Maheta

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1 Comment

mcclosa Over a year ago

The variables such as 't_stu_sql' would not exist in this context as they are located within the foreach statement.

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