create database Test
create table marathi(Names nvarchar(22))
insert marathi SELECT N'???????' ---- Right Query
insert marathi SELECT '???????' ---- Wrong Query
select *from marathi
SqlCommand slc = con.CreateCommand();
slc.CommandText = "Insert into marathi values(@Names)"
slc.Parameters.Add("@Names", SqlDbType.NVarChar, 22);
slc.Parameters["@Names"].Value = textBox1.Text;
slc.ExecuteNonQuery();