Insert Query in C# with MS access Database

Question

When I am inserting data in MS access database .it is not giving any error but data not inserted in database

code:

  private void btnsubmit_Click(object sender, EventArgs e)
    {

        int row = dataGridView1.RowCount;
        for (int i = 0; i < row - 1; i++)
        {
            String str = "insert into JDS_Data(job_no,order_no,Revision,DesignSpec,Engine_Type,date,LE_IN_Designer,CPH_Designer,Exp_Del_Week,Action_code,Rev_Description,Ref_pattern,Name_of_mock_up,EPC_Drawing,Turbocharger_no_Type,Engine_Specific_Requirement,Draft_sketch_with_details,Air_cooler_type,Description_of_Job,SF_No,Standard,Prority_Sequence,Remark,Part_family,Modified_Date,User) values('" + txtjobno.Text + "','" + txtorderno.Text + "','" + txtrevison.Text + "','" + txtds.Text + "','" + txtenginetype.Text + "','" + dateTimePicker1.Text + "','" + txtleindesigner.Text + "','" + txtcphdesigner.Text + "','" + txtexpweek.Text + "','" + txtactioncode.Text + "','" + txtrevdescription.Text + "','" + txtrefpatern.Text + "','" + txtmockup.Text + "','" + txtepcdwg.Text + "','" + txtturbono.Text + "','" + txtenginereq.Text + "','" + txtdraft.Text + "','" + txtaircolertype.Text + "','" + txtdespjob.Text + "','" + dataGridView1.Rows[i].Cells[0].Value.ToString() + "','" + dataGridView1.Rows[i].Cells[1].Value.ToString() + "','" + dataGridView1.Rows[i].Cells[2].Value.ToString() + "','" + dataGridView1.Rows[i].Cells[3].Value.ToString() + "','" + dataGridView1.Rows[i].Cells[4].Value.ToString() + "','" + DateTime.Today + "','" + mdlconnection.user_name + "')";

            int dd = mdlconnection.excuteQuery(str);
            MessageBox.Show(str);
            //if (dd > 0)
            {
                MessageBox.Show("Data Saved Successfully..!!!");

            }

        }

    }   

Code:

    public static int excuteQuery(string q)
    {
        int d = 0;
        try
        {
            OleDbCommand cmd = new OleDbCommand(q, con);
            d = cmd.ExecuteNonQuery();
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
        return d;
    }

Answer 1

if you are using DataContext (you provided to little info) you should rewrite your statement to match the example:

var customers = db.ExecuteQuery<Customer>(@"SELECT CustomerID, CompanyName, ContactName, ContactTitle, 
   Address, City, Region, PostalCode, Country, Phone, Fax
   FROM   dbo.Customers
   WHERE  City = {0}", "London");

I should suggest to use this tutorial for the connection instead actually