How to insert only five values a an ID in SQL and C#

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i want to add only five subject marks for each student...how i will restrict an Stduent_ID ?if Stduent_ID=1 and inserted five times then for six entry i should not add...how i will do it in C# + SQL...

What I have tried:

Declare @Counter int
Set @Counter=(SELECT Count(Student_ID) as 'StudentCount'
FROM CourseSemOne
where Student_ID=3 Group by Student_ID )
if(@Counter >= 6)
print'Sorry! You cannot add more than five subject data for a single stduent'
else
print 'Insert Query'

Posted 21-Jun-16 21:17pm

Member 12388304

Updated 22-Jun-16 22:18pm

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Karthik_Mahalingam · Answer 1 · 2016-06-21T21:28:00

Solution 1

minor correction

SQL

if(@Counter >= 5)

Posted 21-Jun-16 21:28pm

Karthik_Mahalingam

Comments

Member 12388304 23-Jun-16 0:04am

not working for >= 5

Karthik_Mahalingam 23-Jun-16 0:24am

not working means, is it adding a new record?

try this
Declare @Counter int
Set @Counter=(SELECT Count(*) FROM CourseSemOne where Student_ID=3 )
if(@Counter >= 5)
print'Sorry! You cannot add more than five subject data for a single stduent'
else
print 'Insert Query'

Member 12388304 · Answer 2 · 2016-06-22T22:18:00

string sql = "SELECT Count(Student_ID) FROM CourseSemOne where Student_ID='"+Student_ID+"' Group by Student_ID ";
SqlConnection con = new SqlConnection(@"Data Source=LOCALHOST\SQLEXPRESS;Initial Catalog=CS_DB;Integrated Security=True");
con.Open();
SqlCommand cmd = new SqlCommand(sql, con);
int count = Convert.ToInt32(cmd.ExecuteScalar());
con.Close();

if (count <5 && count >=0)
{
obj.insertSemCourseOne(Student_ID, Course_Code, Course_Title, Total_Marks, Obtain_Marks, Grade, Value, Cr_Hours, Grade_Point, GPA, CGPA);
// DatabaseConnnectionClass.UserMessage("Added");
MessageBox.Show("Added Subject");
Dataloaddd();
}
else
{

MessageBox.Show("Sorry!For this Student ID = "+Student_ID+" You cannot add more than 5 data.");
}