return global variable value set inside loop

public class loginbal
{
  public static bool   match = false ;

  public bool check(string username, string password)
  {
        logindal LGD = new logindal();
        DataSet ds1= LGD.logincheck(username, password);

        int noofrows = ds1.Tables["login"].Rows.Count;

        for (int i = 0; i < noofrows; i++)
        {
            if ((ds1.Tables["login"].Rows[i]["username_l"].ToString() == username) && (ds1.Tables["login"].Rows[i]["password_l"].ToString() == password))
            {
                ma开发者_JS百科tch = true;
            }
        }

    return match;
}

I want to return match but its not affected with for loop set statement what i can do to change match according to for loop value and return to method?

As @BrokenGlass and @NullUserException have pointed out, there is no need for a variable match, much less a static one. Just return true if the loop finds a match. If it doesn't, return false.

public bool check(string username, string password)
{
    logindal LGD = new logindal();
    DataSet ds1= LGD.logincheck(username, password);

    int noofrows = ds1.Tables["login"].Rows.Count;

    for (int i = 0; i < noofrows; i++)
    {
        if ((ds1.Tables["login"].Rows[i]["username_l"].ToString() == username)
            && (ds1.Tables["login"].Rows[i]["password_l"].ToString() == password))
        {
            return true;
        }
    }

    return false;
}