c#案例开发全程实录第2版企业人事管理项目mymoudle.cs中保存添加和修改模块
 #region  保存添加或修改的信息
        /// <summary>
        /// 保存添加或修改的信息.
        /// </summary>
        /// <param name="Sarr">数据表中的所有字段</param>
        /// <param name="ID1">第一个字段值</param>
        /// <param name="ID2">第二个字段值</param>
        /// <param name="Contr">指定控件的数据集</param>
        /// <param name="BoxName">要搜索的控件名称</param>
        /// <param name="TableName">数据表名称</param>
        /// <param name="n">控件的个数</param>
        /// <param name="m">标识，用于判断是添加还是修改</param>
        public void Part_SaveClass(string Sarr, string ID1, string ID2, Control.ControlCollection Contr, string BoxName, string TableName, int n, int m)
        {
            string tem_Field = "", tem_Value = "";
            int p = 2;
            if (m == 1){    //当m为1时，表示添加数据信息
                if (ID1 != "" && ID2 == ""){ //根据参数值判断添加的字段
                    tem_Field = "ID";
                    tem_Value = "'" + ID1 + "'";
                    p = 1;
                }
                else{
                    tem_Field = "Sut_id,ID";
                    tem_Value = "'" + ID1 + "','" + ID2 + "'";
                }
            }
            else
                if (m == 2){    //当m为2时，表示修改数据信息
                    if (ID1 != "" && ID2 == ""){ //根据参数值判断添加的字段
                        tem_Value = "ID='" + ID1 + "'";
                        p = 1;
                    }
                    else
                        tem_Value = "Sut_ID='" + ID1 + "',ID='" + ID2 + "'";
                }
                
            if (m > 0){ //生成部份添加、修改语句
                string[] Parr = Sarr.Split(Convert.ToChar(','));
                for (int i = p; i < n; i++)
                {
                    string sID = BoxName + i.ToString();    //通过BoxName参数获取要进行操作的控件名称
                    foreach (Control C in Contr){   //遍历控件集中的相关控件
                        if (C.GetType().Name == "TextBox" | C.GetType().Name == "MaskedTextBox" | C.GetType().Name == "ComboBox")
                            if (C.Name == sID){ //如果在控件集中找到相应的组件
                                string Ctext = C.Text;
                                if (C.GetType().Name == "MaskedTextBox")    //如果当前是MaskedTextBox控件
                                    Ctext = Date_Format(C.Text);    //对当前控件的值进行格式化
                                if (m == 1){    //组合SQL语句中insert的相关语句
                                    tem_Field = tem_Field + "," + Parr[i];
                                    if (Ctext == "")
                                        tem_Value = tem_Value + "," + "NULL";
                                    else
                                        tem_Value = tem_Value + "," + "'" + Ctext + "'";
                                }
                                if (m == 2)
                                {    //组合SQL语句中update的相关语句
                                    if (Ctext=="")
                                        tem_Value = tem_Value + "," + Parr[i] + "=NULL";
                                    else
                                        tem_Value = tem_Value + "," + Parr[i] + "='" + Ctext + "'";
                                }
                            }
                    }
                }
                ADDs = "";
                if (m == 1) //生成SQL的添加语句
                    ADDs = "insert into " + TableName + " (" + tem_Field + ") values(" + tem_Value + ")";
                if (m == 2) //生成SQL的修改语句
                    if (ID2 == "")  //根据ID2参数，判断修改语句的条件
                        ADDs = "update " + TableName + " set " + tem_Value + " where ID='" + ID1 + "'";
                    else
                        ADDs = "update " + TableName + " set " + tem_Value + " where ID='" + ID2 + "'";
            }
        }
        #endregion
请逐句解释下好吗？