BExIS.Web.Shell.Areas.RPM.Controllers.UnitController.unitValidation C# (CSharp) Method

        private bool unitValidation(Unit unit, long[] checkedRecords)
        {
            bool check = true;
            UnitManager unitManager = new UnitManager();
            List<Unit> unitList = unitManager.Repo.Get().ToList(); ;

            if (unit.Name == null || unit.Name == "")
            {
                Session["nameMsg"] = "invalid Name";
                check = false;
            }
            else
            {
                bool nameExist = !(unitList.Where(p => p.Name.ToLower().Equals(unit.Name.ToLower())).Count().Equals(0));
                if (nameExist)
                {
                    Unit tempUnit = unitList.Where(p => p.Name.ToLower().Equals(unit.Name.ToLower())).ToList().First();
                    if (unit.Id != tempUnit.Id)
                    {
                        Session["nameMsg"] = "Name already exist";
                        check = false;
                    }
                    else
                    {
                        Session["nameMsg"] = null;
                    }
                }
                else
                {
                    Session["nameMsg"] = null;
                }
            }

            if (unit.Abbreviation == null || unit.Abbreviation == "")
            {
                Session["abbrMsg"] = "invalid Abbreviation";
                check = false;
            }
            else
            {
                bool abbreviationExist = !(unitList.Where(p => p.Abbreviation.ToLower().Equals(unit.Abbreviation.ToLower())).Count().Equals(0));
                if (abbreviationExist)
                {
                    Unit tempUnit = unitList.Where(p => p.Abbreviation.ToLower().Equals(unit.Abbreviation.ToLower())).ToList().First();
                    if (unit.Id != tempUnit.Id)
                    {
                        Session["abbrMsg"] = "Abbreviation already exist";
                        check = false;
                    }
                    else
                    {
                        Session["abbrMsg"] = null;
                    }
                }
                else
                {
                    Session["abbrMsg"] = null;
                }
            }

            if (checkedRecords != null)
            {
                Session["dataTypeMsg"] = null;
            }
            else
            {
                Session["dataTypeMsg"] = "Choose at least one Data Type.";
                check = false;
            }

            if (!String.IsNullOrEmpty(unit.Dimension.Name) && unit.Dimension.Name != "Select or Enter")
            {
                Session["dimensionMsg"] = null;
            }
            else
            {
                Session["dimensionMsg"] = "Select or create an Dimension.";
                check = false;
            }

            return check;
        }