Insertion of Data in English and Arabic in one column in SQL Server 2016

Question

Hi I want to Insert a data that is in Persian And English the string that I want to insert is '(پایه ۱۹۸=OID) -عبوری-متوسط' but it shows ?????? instead of the data ... I want to insert the data by stored Procedure My stored Procedure is

USE [DAT1]
GO
/****** Object:  StoredProcedure [dbo].[SP_insert]    Script Date: 7/25/2018 3:32:46 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON

SET ANSI_WARNINGS off;
GO

ALTER proc [dbo].[SP_insert]
@FirstName nvarchar(256) = null,
@LastName  nvarchar(50),
@EmailAddress nvarchar (50),
@phone int  
as
begin 
insert into [tbl_test ] values (@FirstName,@LastName,@EmailAddress,@phone)

end 

when I execute the procedure using N it works but the data comes from an app and I can't put N

in ADO.net I Want to Insert that data here is My code

  protected void Button1_Click(object sender, EventArgs e)
    {
        SqlCommand cmd = new SqlCommand("SP_insert", con);
        cmd.CommandType = CommandType.StoredProcedure;


        string mmmm = "(پایه 198=OID) -عبوری-متوسط";
        cmd.Parameters.AddWithValue("@FirstName", mmmm);
        cmd.Parameters.AddWithValue("@LastName", "ascascsacsa");
        cmd.Parameters.AddWithValue("@EmailAddress", "advadsvasdv");
        cmd.Parameters.AddWithValue("@phone", 1);
        cmd.ExecuteNonQuery();

    }

when I execute the Code It shows the Error

String or binary data would be truncated.
The statement has been terminated.

how can I solve this Thanks :)

Answer 1

Your database is just storing what it's receiving and it will store the desired characters just fine with your current setup if the tables are set to use N types (so check that too). Alter your application code to use a wider character set.