problem insert to SQL server compact database in C#

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I trying to insert data to my SQL server compact database(.sdf) in C#
This is my code i allways popup not inserted error message
waht is the wronge !
I new to C#
Thank in advance!

C#

int index= cb1.SelectedIndex; //cb1=combo box
            SqlCeConnection con = new SqlCeConnection("Data Source="C:\application\application.sdf"");
            con.Open();
            SqlCeCommand cm = new SqlCeCommand("INSERT INTO tbl_user(u_name, u_scl, u_cmb, u_id) VALUES(@u_name, @u_scl, @u_cmb, @u_id)", con);
            cm.Parameters.AddWithValue("@u_name", txtname.Text);
            cm.Parameters.AddWithValue("@u_scl", txtscl.T.Text);
            cm.Parameters.AddWithValue("@u_cmb",index);
            cm.Parameters.AddWithValue("@u_id", 1);
            try
            {
                int eff = cm.ExecuteNonQuery();
                
                if (eff == 0)
                {
                    MessageBox.Show("Student Added ", "Done");
                }
                else
                {
                    MessageBox.Show("not inserted ", "Error");
                }
            }
            catch (SqlCeException ex)
            {
                MessageBox.Show(ex.ToString());
                //MessageBox.Show("User not Inserted", "Error");
            }
            con.Close();

Posted 3-Nov-13 19:58pm

Manoj Chamikara

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Bernhard Hiller 4-Nov-13 2:36am

And the exception is ...?

Rishikesh_Singh 4-Nov-13 2:50am

Check the exception and inner exception. Check the value of your each parameter and also double check your column datatype of the table you are trying to insert. If you still can't figure it out,update your question with all the information i mentioned.

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member 8888995 · Answer 1 · 2013-11-03T20:55:00

Solution 1

cross check with database that row is actually inserted or not because ExecuteNonQuery()
method will return number of rows affected so it should be 1 if one row is inserted properly and you are displaying message 'not inserted' if eff is other than 0.
set breakpoint at

int eff = cm.ExecuteNonQuery();

find the value of eff and modify code accordingly.
Also verify your connection string.
Data Source=C:\application\application.sdf;Persist Security Info=False;

this is standard connection string for sql server compact.

--
Thanks

Posted 3-Nov-13 20:55pm

member 8888995

Updated 3-Nov-13 20:56pm

v2

Comments

Manoj Chamikara 5-Nov-13 2:19am

Row insert properly ExecuteNonQuery () returns the value 1 . When I check the database right click table and show table data there is no new row I insert but I insert the same data again error occurred "Duplicate value cannot be inserted into a queindex .............. "
Why is that?
i cannot find why is that
Thank you so much your reply sorry about my late

member 8888995 5-Nov-13 4:34am

Hey Manoj ,
No need to say sorry for being late. Try by refreshing table, disconnect and reconnect to database or restart sql server.

--
Thanks