How do I find except SQL command in C#?

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Temp table I assign the values I read in excel table.If the temp table and student table are different, I want to add different ones to the student table.But I can't add with these operations.How can I do it. The SQL command is giving an error and I can't calculate whether it has an int value.

What I have tried:

using(var different=new SqlCommand("SELECT ID,Name,Surname from ##mytemptable except SELECT ID,Name,Surname from Student)),connection)
SqlDataReader dr =different.ExecuteReader();
int newdifferentvalue=0;

if(dr.Read())
{
     newdifferentvalue=dr.GetInt32(0);
using(var different=new SqlCommand("INSERT INTO ID,Name,Surname from Student (SELECT ID,Name,Surname from ##mytemptable except SELECT ID,Name,Surname from Student)),connection)
MessageBox.Show("Different Information is added");
}

else

{
<pre>MessageBox.Show("Different Information has no value.So not added.");

}

Posted 28-Jul-19 9:04am

StudentSC

Updated 28-Jul-19 11:19am

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Afzaal Ahmad Zeeshan 28-Jul-19 17:19pm

What is the exception that it is giving?

[no name] 28-Jul-19 17:35pm

using(var different=new SqlCommand("SELECT ID,Name,Surname from ##mytemptable except SELECT ID,Name,Surname from Student)),connection) this line give except.But this line
using(var different=new SqlCommand("INSERT INTO ID,Name,Surname from Student (SELECT ID,Name,Surname from ##mytemptable except SELECT ID,Name,Surname from Student)),connection) not insert.command error.
and this line not give int value=>newdifferentvalue=dr.GetInt32(0); //not convert to int value.

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OriginalGriff · Answer 1 · 2019-07-28T11:20:00

Solution 1

While a DataReader is open, the Connection is in use exclusively by that DataReader. You cannot execute any commands for the Connection, including creating another DataReader, INSERTing data, UPDATEing rows, or any other operation until the original DataReader is closed.

If you try to do it, you will always get an error.

Posted 28-Jul-19 11:20am

OriginalGriff

Comments

[no name] 28-Jul-19 17:37pm

Thanks for informing.So how can I do in this case.

Afzaal Ahmad Zeeshan 28-Jul-19 17:47pm

By closing the DataReader.

[no name] 28-Jul-19 18:05pm

dr.Close(); that way if I finally turn it off