stored procedure for multilingual

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C#

my problem is how to pass the Hindi letters from c# .net pages to my stored procedures?

I've written a sql stored procedure like this

CREATE proc [testinsert]
(
@nameE nvarchar(max),
@nameT nvarchar(Max)
)
as
begin
   INSERT INTO tblmultilangstudentE ([name]) VALUES (@nameE);
   INSERT INTO tblmultilangstudentT ([name]) VALUES (@nameT);
end

i passed the values like this

SqlCommand cmd = new SqlCommand("testinsert", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@nameE", txtEng.Text);
cmd.Parameters.AddWithValue("@nameT", txtTamil.Text);
con.Open();
cmd.ExecuteNonQuery();
con.Close();

But it's not store the Hindi values in tblmultilangstudentT Table.In database
only '?????' submited. A critical Problem for advance brainers. Thanks in Advance........

[edit]Code blocks added for clarity - OriginalGriff[/edit]