Forms Data Controls :: Displaying Real Time Data (GridView)?
Mar 24, 2010
I have a Table (in SQL Server) that is being updated roughly every minute or so with new records being inserted from various sources. The number of records inserted in this duration varies from a few records up to dozens of new records. I am using an update panel to rebind my data every minute to keep the GridView current. Now that I have the data refreshing I am looking for a better solution than reloading the data every minute. how to best keep my GridView up to date? Here is what I would like to accomplish:
1. Load the GridView and refresh the contents every minute. (60 second intervals)
2. When the GridView is refreshed every minute I would like to append only the new records to the existing grid, rather than bringing back the entire result set with each round trip to the database.
3. I would like a visual cue to identify the rows that have been inserted into the GridView. If new rows were to flash/flicker with a background color (yellow) that would be ideal.
Am I even using the correct control for displaying real time data, or are their other options? I essentially am looking to find the preferred method of displaying data that is being updated in real time in a web application. I'm hoping there is a solution involving AJAX but I haven't been able to find much on The Google. I am open to changing anything and everything about my approach -- this is largely a learning exercise. For testing purposes I am currently using LinqDataSource in conjunction with a GridView in an UpdatePanel being refreshed by a Timer control every 60 seconds. Informational: I have also started playing with the [URL] in place of the Timer control. However, for the purposes of this example I would be content to achieve the desired behavior using native controls as I have described them above.
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[Code]....
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[Code]....
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[code]...
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Code:
protected void Button1_Click(object sender, EventArgs e)
{
String ext = System.IO.Path.GetExtension(FileUpload1.FileName).ToUpper();
if (ext == ".TXT")
{
String content = System.Text.Encoding.ASCII.GetString(FileUpload1.FileBytes);
String[] ar = content.Split(';');
GridView1.DataSource = ar;
GridView1.DataBind();
}
}
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select distinct tbl.emp_code, b.EmplName, convert(varchar, tbl.punched_date,101) as Punched_date,
(select convert(varchar(8),itbl.PUNCHED_TIME, 114)+', '
from Trn_Capture_Data_New itbl
where itbl.EMP_CODE=tbl.emp_code and itbl.PUNCHED_DATE=tbl.punched_date and itbl.EMP_CODE='4'
and tbl.punched_date >= '03/27/2013' and tbl.punched_date <= '03/28/2013'
for xml path('')) Punched_Time
[Code] ....
I have the above query and that gives me result
Emp_code EmplName Punched_date Punched_Time
4 XXX 3/27/2013 14:22:00, 09:44:00, 10:38:00, 11:01:00, 16:12:00, 18:25:00,
4 XXX 3/28/2013 13:14:00, 09:49:00, 18:02:00,
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Date,IN,OUT,IN,OUT
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