问售票系统:比较两个字符串

EN

protected void BtnConfirmSignup_Click(object sender, EventArgs e)
{
    int f = 0;

    SqlConnection con = new SqlConnection("Data Source=(localdb)\\MSSQLlocalDB;Initial Catalog=traveller;Integrated Security=True;Pooling=False");
    SqlCommand cmd;
    SqlDataReader read;

    /*DEBUG: Prevent duplicate usernames*/

    try
    {
        Session["user"] = TxtUsrName.Text;
        Session["pass"] = TxtPsswd.Text;
        Session["email"] = TxtEmail.Text;

        //Label6.Text = "Faf";
        //  if ((Label6.Text).Equals(TxtUsrName.Text))
        //{
        //  Label6.Text = "dafuqqqq";
        //}
        //{
        //  Label6.Text = "wtf";
        //   Label6.Text = TxtUsrName.Text;
        //}

        cmd = new SqlCommand("select Name from Useriden", con);
        con.Open();
        read = cmd.ExecuteReader();

        while (read.Read())
        {
            Label6.Text = read["Name"].ToString();
            Label1.Text = "aaa";
            //Label6.Text = "Faf";
            if ((Label6.Text).Equals(TxtUsrName.Text))
            {
                f = 1;
                //Label6.Text = "Duplicate Username";
                break;
            }
        }

        if (f == 1)
        {
            Label6.Text = "Duplicate Username";
        }
        else if (f == 0)
        {
            Response.Redirect("SignUpNext.aspx");
        }
    }
    catch (Exception ex) 
    {
        LabelUserName.Visible = true;
        LabelUserName.Text = ex.Message;
        con.Close();
        ViewState["Caption"]=ex.Message;                
    }
}