Solved

GridView DataSource

Posted on 2010-09-19
5
410 Views
Last Modified: 2012-06-21
I have the following codes.

Code 1
 
            string connectionString = @"Data Source=.\SQLExpress;Initial Catalog=master;Integrated Security=True";
            string sql = "SELECT TOP 10 * FROM [master].[sys].[syslanguages]";

            using (SqlConnection connection = new SqlConnection(connectionString))
            using (SqlCommand command = new SqlCommand(sql, connection))
            {
                connection.Open();

                DataTable dt = new DataTable();
                SqlDataReader reader = command.ExecuteReader();
                dt.Load(reader);
                connection.Close();
                GridView1.DataSource = dt;
                GridView1.DataBind();
            }

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Code 2
 
            string connectionString = @"Data Source=.\SQLExpress;Initial Catalog=master;Integrated Security=True";
            string sql = "SELECT TOP 10 * FROM [master].[sys].[syslanguages]";

            using (SqlConnection connection = new SqlConnection(connectionString))
            using (SqlCommand command = new SqlCommand(sql, connection))
            {
                connection.Open();

                SqlDataReader reader = command.ExecuteReader();
                GridView1.DataSource = reader;
                GridView1.DataBind();
            }

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Both codes work absolutely fine, but which one is better?
Thanks!
0
Comment
Question by:mawingpui
5 Comments
 
LVL 6

Accepted Solution

by:
ingriT earned 125 total points
ID: 33711748
I think the second, why waste memory on a datatable when you don't need it?
0
 

Author Comment

by:mawingpui
ID: 33711780
thanks ingriT, I am also thinking about database performance.
If I use the reader as DataSource, will it hold the connection for a long time when dealing with large amounts of data?
0
 
LVL 52

Assisted Solution

by:Carl Tawn
Carl Tawn earned 125 total points
ID: 33711906
Both your examples do pretty much the same thing. There isn't much point in loading the data into a DataTable unless you are planning on caching the data and allowing filtering/sorting and therefore want to keep a copy of the data available so you don't have to requery the database.
0
 
LVL 13

Assisted Solution

by:Naman Goel
Naman Goel earned 125 total points
ID: 33712090
Yes, There is not use of loading that data into DataTable if you are not planning to cache that data. So Please use second example

please refer to http://www.eggheadcafe.com/articles/20030205.asp
0
 
LVL 12

Assisted Solution

by:starlite551
starlite551 earned 125 total points
ID: 33712338
I prefer using Disconnected Architecture in ADO.NET.. DataSets are cool coz they dont need Open Connections as in case of SqlDataReaders..
So I would rather go for the following code :

string connectionString = @"Data Source=.\SQLExpress;Initial Catalog=master;Integrated Security=True";
string sql = "SELECT TOP 10 * FROM [master].[sys].[syslanguages]";

using (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand command = new SqlCommand(sql, connection))
{
       connection.Open();
       SqlDataAdapter da = new SqlDataAdaper(cm);
       DataSet ds = new DataSet();
       da.Fill(ds);
       GridView1.DataSource = ds.Tables[0];
       GridView1.DataBind();  
}

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