Gridview data binding - asp.net

Question

I have a problem when when while loop repeats it iteration the already binded is replacing by new records but i want to bind all data by the iteration of while loop.
I am a new I have no idea how it can be.
while (i >= 0)
{
if (i != 0)
{
group_idd = group_ids[--i];
}
SqlConnection connection3 = new SqlConnection(ConfigurationManager.ConnectionStrings["Connection_String"].ConnectionString);
using (connection3)
{
using (SqlCommand cmdd = new SqlCommand())
{
cmdd.CommandText = "SELECT [news_category],[id] FROM [news_profile] WHERE [user_id]='" + user_id + "' AND [group_id]='" + group_idd + "' AND [profile_id] IS NOT NULL";
cmdd.Connection = connection3;
connection3.Open();
GridView1.DataSource = cmdd.ExecuteReader();
GridView1.DataBind();
connection3.Close();
}
}
if (i == 0)
{
--i;
}
}

Answer 1

Create a small class
public class NewsProfile
{
public string NewsID { get; set; }
public string NewsCategory { get; set; }
}
Now in your code-behind, do this
List<NewsProfile> newsProfiles = new List<NewsProfile>();
// while loop here
SqlConnection connection3 = new SqlConnection(ConfigurationManager.ConnectionStrings["Connection_String"].ConnectionString);
using (connection3)
{
using (SqlCommand cmdd = new SqlCommand())
{
cmdd.CommandText = "SELECT [news_category],[id] FROM [news_profile] WHERE [user_id]='" + user_id + "' AND [group_id]='" + group_idd + "' AND [profile_id] IS NOT NULL";
cmdd.Connection = connection3;
connection3.Open();
while (reader.Read())
{
NewsProfile np = new NewsProfile();
np.NewsCategory = reader.IsDBNull(0) ? "" : reader.GetString(0);
np.NewsID = reader.IsDBNull(1) ? "" : reader.GetString(1);
newsProfiles.Add(np);
}
}
}
//end while loop here
GridView1.DataSource = newsProfiles;
GridView1.DataBind();