How to pass unicode charcters to procedures parameters ?

var employess = db.spEnqGetEmployeesOfUser(filter.LogUserID, filter.StartIndex, filter.EndIndex, filterText, sortText).ToList();

CREATE PROCEDURE [dbo].[spEnqGetEmployeesOfUser](
					@UserID INT,
					@StartNumber INT,
					@PageSize INT,
					@Filter NVARCHAR(MAX),
					@Sort VARCHAR(MAX)
				   )
AS
BEGIN

CREATE PROCEDURE [dbo].[spEnqGetEmployeesOfUser](
					@UserID INT,
					@StartNumber INT,
					@PageSize INT,
					@Filter NVARCHAR(MAX),
					@Sort VARCHAR(MAX)
				   )
AS
BEGIN

 DECLARE @Employees Table 
(
	RowNumber INT PRIMARY KEY,
	TotalCount INT,
	UserID INT UNIQUE NOT NULL,
	EmployeeID INT UNIQUE NOT NULL,
	EmployeeCode NVARCHAR(150) NOT NULL,
	EmployeeName NVARCHAR(150),
	Division NVARCHAR(150)
)

IF (@Sort IS NULL OR LTRIM(RTRIM(@Sort)) = '')
BEGIN
	SET @Sort = 'EmployeeName'
END

DECLARE @SQLQuery AS NVARCHAR(MAX)
SET @SQLQuery = ' SELECT * FROM (
	SELECT ROW_NUMBER() OVER(ORDER BY ' + @Sort + ') AS RowNumber,COUNT(UserID) OVER() AS TotalCount,  MPR.* FROM (
		SELECT u.UserID,u.EmployeeID,e.Code AS EmployeeCode,u.Name AS EmployeeName, u.Division 
		FROM F_UserByHierarchy(' +  CAST(@UserID AS VARCHAR(15)) + ') u
		INNER JOIN [User] us ON u.UserID = us.UserID
		INNER JOIN Employee e ON u.EmployeeID = e.EmployeeID
		INNER JOIN DesignationLevel dl ON us.DesignationLevelID = dl.DesignationLevelID
		WHERE dl.IsMappingRequires = 1
		) MPR '

IF  (@Filter IS NOT NULL AND LTRIM(RTRIM(@Filter)) <> '')
BEGIN
	SET @SQLQuery = @SQLQuery + ' WHERE ' + @Filter
END		

SET @SQLQuery	= @SQLQuery + ' ) MP
		WHERE RowNumber BETWEEN ' + CAST((@StartNumber + 1) AS VARCHAR(15)) +  
	   ' AND ' + CAST(((@StartNumber + @PageSize))  AS VARCHAR(15)) 

--SELECT @SQLQuery
INSERT INTO @Employees 
EXEC (@SQLQuery)

SELECT * FROM @Employees
END