How to fetch user details by user name in multilingual website in asp.net

In my multilingual website i select arabic language. I created a user from registration page. Now if i login with that username following error comes:

Failed to convert parameter value from a String to a Int64.

I have created stored procedure given below:

SQL:

CREATE PROCEDURE [dbo].[UserLogin]
    @UserName   NVARCHAR(100)
AS
BEGIN
    SELECT  * FROM  Users WHERE UserName = @UserName
END

ASPX CODE BEHIND:

Dim UserName As String = "N'" & txtLogin.Text & "'"
Dim _dtLogin As Data开发者_运维百科Table = oUser.UserLogin(UserName)

BUSINESS LOGIC:

Public Function UserLogin(ByVal UserName As String) As DataTable
    _dbCommand = _database.GetStoredProcCommand("UserLogin")
    _database.AddInParameter(_dbCommand, "UserName", SqlDbType.NVarChar, UserName)
    _Dt = _database.ExecuteDataSet(_dbCommand).Tables(0)
End Function