ternary operator
if ($scope.SearchSalesOrderAndCompanyName !== undefined && $scope.SearchSalesOrderAndCompanyName != null ) {
SearchCriteria += " AND [SalesOrderNo] LIKE '%" + $scope.SearchSalesOrderAndCompanyName + "%' OR ([SO].[CompanyNameOnBill] LIKE '%" + $scope.SearchSalesOrderAndCompanyName + "%')";
}
if ($scope.FromDate !== undefined && $scope.FromDate !=null) {
SearchCriteria += " AND [SO].[SalesOrderDate] LIKE '%" + $scope.FromDate + "%'";
}