从SQL Server数据库中读取，然后读取前3个值，并将它们输出到asp.net中的标签中

Question

I am trying to read the top three values from my database and output them into separate labels.

This is the code I have so far:

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["FastHostSS_homeConnectionString"].ConnectionString);
conn.Open();

var readDomain = ("SELECT tldName FROM tld");

SqlCommand com = new SqlCommand(readDomain, conn);

SqlDataReader myReader = com.ExecuteReader();

while (myReader.Read())
{
    Domain1_lb.Text = (myReader["TOP 1 tldName"].ToString());
    Domain2_lb.Text = (myReader["TOP 2 tldName"].ToString());
    Domain3_lb.Text = (myReader["TOP 3 tldName"].ToString());
}

Answer 1

You need to decide which label to assign to based on the loop count.

int index = 0;
while (myReader.Read())
{
    var tld = myReader["tldName"].ToString();
    ++index;
    if(index == 1) Domain1_lb.Text = tld;
    if(index == 2) Domain2_lb.Text = tld;
    if(index == 3) Domain3_lb.Text = tld;
}

This is nowadays normally done using data binding, where a framework takes care of the assignments.