กำหนดเงื่อนไขไว้แล้วแต่ทำไม การวน loop รอบแรกถึงหลุดเงื่อนไข แนะนำทีครับ ขอบคุณครับ

protected void Button3_Click(object sender, EventArgs e)
    {
        RadioButton RG1 = null;
        if (RadioButton1.Checked == true)
        {
            RG1 = RadioButton1;

            SqlTransaction tr = objConn.BeginTransaction();
            SqlCommand cmd = objConn.CreateCommand();

            int levelseq = 1;
            try
            {
                cmd.CommandType = CommandType.Text;
                cmd.Transaction = tr;
                
                for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
                    {
                        string typeCarbinet = "1";
                        string typeDrawer = "2";
                        string typeFiles = "3";
                        string typeBinder = "4";

                        string chkCabinet = GridView1.Rows[i].Cells[4].Text.Trim();
                        string chkDrawer = GridView1.Rows[i].Cells[5].Text.Trim();
                        string chkFiles = GridView1.Rows[i].Cells[6].Text.Trim();
                        string chkBinder = GridView1.Rows[i].Cells[7].Text.Trim();

                        if (i >= 0)
                        {
                            bool testchk = false;
                            for (int c = 0; c < i; c++) //###Check Cabinet###
                                if (GridView1.Rows[i].Cells[4].Text.Trim() == GridView1.Rows[c].Cells[4].Text.Trim())
                                {
                                    testchk = true;
                                }
                            if (testchk == false)
                            {
                                cmd.CommandText = "Insert Into DIP_LEVEL2(LEVEL_SEQ,LEVEL_TYPE,LEVEL_NAME)" + " values ('" + levelseq + "','" + typeCarbinet + "','" + chkCabinet + "')";
                                cmd.ExecuteNonQuery();
                                levelseq++;
                            }
                        }
                        if (i >= 0)
                        {
                            bool testchk = false;
                            for (int d = 0; d < i; d++) //###Check Drawer###
                                if (GridView1.Rows[i].Cells[5].Text.Trim() == GridView1.Rows[d].Cells[5].Text.Trim())
                                {
                                    testchk = true;
                                }
                            if (testchk == false)
                            {
                                cmd.CommandText = "Insert Into DIP_LEVEL2(LEVEL_SEQ,LEVEL_TYPE,LEVEL_NAME)" + " values ('" + levelseq + "','" + typeDrawer + "','" + chkDrawer + "')";
                                cmd.ExecuteNonQuery();
                                levelseq++;
                            }
                        }
                        if (i >= 0)
                        {
                            bool testchk = false;
                            for (int f = 0; f < i; f++) //###Check Files###
                                if (GridView1.Rows[i].Cells[6].Text.Trim() == GridView1.Rows[f].Cells[6].Text.Trim() && GridView1.Rows[i].Cells[6].Text.Trim() == GridView1.Rows[f].Cells[6].Text.Trim())
                                {
                                    testchk = true;
                                }
                            if (testchk == false)
                            {
                                cmd.CommandText = "Insert Into DIP_LEVEL2(LEVEL_SEQ,LEVEL_TYPE,LEVEL_NAME)" + " values ('" + levelseq + "','" + typeFiles + "','" + chkFiles + "')";
                                cmd.ExecuteNonQuery();
                                levelseq++;
                            }
                        }
                        if (i >= 0)
                        {
                            bool testchk = false;
                            for (int b = 0; b < i; b++) //###Check Binder###
                                if (GridView1.Rows[i].Cells[7].Text.Trim() == GridView1.Rows.Cells[7].Text.Trim())
                                {
                                    testchk = true;
                                }
                           if (testchk == false)
                            {
                                if(GridView1.Rows[i].Cells[7].Text.Trim() != "") //เช็คเงื่อนไขว่าต้องไม่เป็นค่าว่างถึงจะทำ
                                {
                                cmd.CommandText = "Insert Into DIP_LEVEL2(LEVEL_SEQ,LEVEL_TYPE,LEVEL_NAME)" + " values ('" + levelseq + "','" + typeBinder + "','" + chkBinder + "')";
                                cmd.ExecuteNonQuery();
                                levelseq++;
                                }
                            }
                        }
                    }
                    
                    tr.Commit();
                    Label4.Text = "บันทึกข้อมูลเรียบร้อย";
            }
            catch (SqlException ex)
            {
                tr.Rollback();
                Label2.Text = "Error - TRANSACTION ROLLED BACK\n" + ex.Message;
            }
            catch (Exception ex)
            {
                tr.Rollback();
                Label2.Text = "System Error\n" + ex.Message;
            }
            finally
            {
                objConn.Close();
                tr.Dispose();
            }
        }