No error and data not inserted to sql server table?

private void button1_Click(object sender, EventArgs e)
{
    try
    {

        SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ProTestDB.mdf;Integrated Security=True;User Instance=True");
        string name = textBox1.Text;
        string sqlstr = ("INSERT INTO Users VALUES('" + textBox1.Text + "')");
        SqlCommand cmd = new SqlCommand(sqlstr, conn);
        cmd.Parameters.AddWithValue("Name", name);

        conn.Open();
        cmd.ExecuteNonQuery();

        conn.Close();
    }
    catch
    {
        MessageBox.Show("error");
    }
}