How to generate auto incriment field in ASP.NET using linq to SQL

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i was trying Data insert using Linq to SQl in asp.net C#.

I got problem with Primery key, How to write code for this.. pls help me..

What I have tried:

C#

protected void Button4_Click(object sender, EventArgs e)
    {
        linkdbDataContext DB = new linkdbDataContext();
        subject TC = new subject();

// "NOS" is the primerykey and autoincriment field, define in Sql Server.
        TC.Nos = true;
        TC.CLASSS = txclass.Text;
        TC.Subjects = txsubject.Text;
        TC.lesson = txlesson.Text;
        TC.chapter = txchapter.Text;

        DB.subjects.InsertOnSubmit(TC);
        DB.SubmitChanges();  

    }

Posted 30-Nov-16 8:31am

Member 11917879

Updated 30-Nov-16 9:17am

Ehsan Sajjad

v2

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Ehsan Sajjad 30-Nov-16 14:53pm

what is the datatype of it in sql server?

2 solutions

Solution 1

There is some contradiction in what you have here...

C#

// "NOS" is the primerykey and autoincriment field, define in Sql Server.
TC.Nos = true;

So either NOS is a SID (so numeric) or it is boolean (as you set it to 'true')...
In any case you need not and can not set the value for an auto-increment (SID) field in SQL, you have to left it to the SQL engine...
Set all the other field and insert you new record, SQL will assign the next value to the auto-increment field...

Posted 30-Nov-16 9:09am

Kornfeld Eliyahu Peter

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Cristina Carrasco Angulo · Accepted Answer · 2016-11-30T09:17:00

I gues this your table:

Subject

Nos	Int (identity\|autoincrement)
CLASSS	varchar
Subjects	varchar
lesson	varchar
chapter	varchar

if the Nos Field is integer:

1- Change the datatype from the entity Subject, It looks like a bool, change bool for int

2- Change:

C#

protected void Button4_Click(object sender, EventArgs e)
    {
        linkdbDataContext DB = new linkdbDataContext();
        subject TC = new subject();
 
        // "NOS" is the primerykey and autoincriment field, define in Sql Server.
        // TC.Nos = true;
        TC.Nos = 0 //Zero the autoincrement should work, if not try comment this line
        TC.CLASSS = txclass.Text;
        TC.Subjects = txsubject.Text;
        TC.lesson = txlesson.Text;
        TC.chapter = txchapter.Text;
 
        DB.subjects.InsertOnSubmit(TC);
        DB.SubmitChanges();  
 
    }