How to insert gujarati text in database

private void button1_Click(object sender, EventArgs e)
      {

      string constr = @"Data Source=GREATCOMPUTER\SQLSERVERS;Initial Catalog=test3;Integrated Security=True;Pooling=False";
          SqlConnection cn = new SqlConnection(constr);
          string str = "insert into tbl (Name) values(N'" + textBox1.Text + "')";
          SqlCommand cmd = new SqlCommand(str,cn);
          cn.Open();
          int i = cmd.ExecuteNonQuery();
          cn.Close();
          if (i != 0)
          {
              MessageBox.Show("Inserted.....");
          }


      }