INSERT ข้อมูลลงใน ACCESS ไม่ได้ รบกวนทีคร๊าบบบ T^T [Win app C#]

  private void bntadd_Click(object sender, EventArgs e)
        {   
            OleDbCommand objCmd = new OleDbCommand();
            String strConnString,strSQL;
            OleDbConnection objConn;
            DateTime dt = DateTime.Now;
            string mmAdd1 = DateTime.Now.AddDays(0).ToString("dd") + "/" + dt.ToString("MM", new System.Globalization.CultureInfo("th-TH")) + "/" + dt.ToString("yyyy", new System.Globalization.CultureInfo("th-TH"));
            
            string librarian="xxxxxxxxxxxxxxx";

            strConnString = "Provider=Microsoft.JET.OLEDB.4.0;Data Source=C:\\Catalog.mdb";
            strSQL = "INSERT INTO Table_Catalog (ID,Name,Author,Company,Year,Price,Amount,By,Date)" + " VALUES " + "('" + txtid.Text + "','" + txtname.Text + "','" + txtauther.Text + "','" + txtcompany.Text + "','" + txtyear.Text + "'," + txtprice.Text + "," + txtamount.Text + ",'" + librarian + "','" + mmAdd1 + "')";

                objConn = new OleDbConnection(strConnString);
                if (objConn.State == ConnectionState.Open) 
                {
                    objConn.Close();   
                }
                objConn.ConnectionString = strConnString;
                objConn.Open();
                
              
              
                objCmd.Connection = objConn;
                objCmd.CommandText = strSQL;
                objCmd.CommandType = CommandType.Text;
                
            try{
                objCmd.ExecuteNonQuery(); 
                MessageBox.Show("Record Inserted");
                
            }
            catch (Exception ex)
            {
                   // Error เพราะขึ้น   MessageBox.Show(ex.ToString());
                    MessageBox.Show(ex.ToString());
             
            }
            objCmd = null;
            objConn.Close();
            objConn = null;
        }