Violation of PRIMARY KEY constraint 'PK_LogIn'. Cannot insert duplicate key in object 'dbo.LogIn'.

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C#

if (Module1.action == "Add")
                    {
                        SqlCommand com = new SqlCommand();
                        com.CommandText = "insert into Pack_Details values(@PdNo,@PNo,@Dscription,@Quantity,@Rate,@Deleted)";
                        com.Parameters.AddWithValue("@PdNo", cbpdno.Text);
                        com.Parameters.AddWithValue("@PNo", cbpno.Text);
                        com.Parameters.AddWithValue("@Dscription", txtdesc.Text);
                        com.Parameters.AddWithValue("@Quantity", txtqunt.Text);
                        com.Parameters.AddWithValue("@Rate", txtrate.Text);
                        //com.Parameters.AddWithValue("@UNo",Module1.st);
                        com.Parameters.AddWithValue("@Deleted", "0");
                        com.Connection = Module1.con;
                        try
                        {
                            Module1.con.Open();
                            com.ExecuteNonQuery();
                            MessageBox.Show("Record saved");
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                        Module1.con.Close();
                        fill();
                        binding();
                        Button(!Module1.b);
                        Locked(Module1.d);
                        // Clientid = cbpno.Text
                        return;
                    }

Posted 11-Apr-14 0:22am

Vijay Tiwari

Updated 11-Apr-14 1:21am

Mike Meinz

v2

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Comments

Vijay Tiwari 11-Apr-14 6:25am

here pdno is an primary key

Maciej Los 11-Apr-14 6:51am

Does pdno is AUTOINCREMENT field?

2 solutions

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2014-04-11T01:05:00

Quote:
Violation of PRIMARY KEY constraint 'PK_LogIn'. Cannot insert duplicate key in object 'dbo.LogIn'

It means you are breaking the rules of PrimaryKey and that is to insert another key, which is already present in a row.

Primary key can't be duplicate. When you explicitly insert that from the code, it should be unique that is it should different than all the key values present in that particular column.

If you insert something, which is already present, then this issue comes.

Maciej Los · Answer 2 · 2014-04-11T00:55:00

Solution 1

The error message says exactly what is wrong.
If pdno is autoincreament[^] and identity[^] field, remove it from insert list and check it again.

Posted 11-Apr-14 0:55am

Maciej Los

Comments

Vijay Tiwari 11-Apr-14 7:17am

yes it is the autoincrement

Maciej Los 11-Apr-14 7:22am

So, reove it from insert list ;)