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Sorting Data in a Dataset in ASP.NET

Posted on 2007-11-28
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Last Modified: 2013-11-26
I have a custom class that takes LoginID, FirstName, Lastname as params and does the following.
1) Query Active Directory for any people that match any of the three values above.
2) Plug the search results into a dataset and return this dataset object.

In my ASPX page, I have a repeater control and three textfields to allow a user to enter a firstname, lastname, login ID that is passed to the custom class. When the user clicks the button, the code-behind code calls the custom class, performs the search and returns a dataset. I want to be able to sort this data, but the code I am using does not seem to work. Am I doing something wrong in the code?
'**PART OF CLASS THAT RETURNS DATASET POPULATED WITH DATA FROM AN ACTIVE DIRECTORY QUERY
Dim ds As New DataSet("ADSearchResults")
Dim table As New DataTable("tblSearchResults")
table.Columns.Add("LoginID", System.Type.GetType("System.String"))
table.Columns.Add("Fname", System.Type.GetType("System.String"))
table.Columns.Add("Lname", System.Type.GetType("System.String"))
 
Dim result As SearchResult
For Each result In searcher.FindAll()
    Dim dr As DataRow = table.NewRow()
    dr(0) = result.GetDirectoryEntry.Properties.Item("SAMAccountName").Value
    dr(1) = result.GetDirectoryEntry.Properties.Item("givenName").Value
    dr(2) = result.GetDirectoryEntry.Properties.Item("sn").Value
    table.Rows.Add(dr)
Next
 
table.DefaultView.Sort = "Lname, fname, loginID"
ds.Tables.Add(table)
return ds
 
 
 
 
'**ON PAGE LOAD IN THE CODE BEHIND FORM...
repGrid.DataSource = ds
repGrid.DataMember = "tblSearchResults"
repGrid.Visible = True
repGrid.DataBind()
 
 
 
 
'**REPEATER USED IN ASPX PAGE
		<asp:Repeater ID="repGrid" runat="server" Visible="False">
		<HeaderTemplate>
		 <table border="1">
		  <tr>
		   <th>Login ID</th>
		   <th>Fname</th>
		   <th>Lname</th>
		  </tr>
		 </HeaderTemplate>
		<ItemTemplate>
		 <tr>
		  <td><%# DataBinder.Eval(Container, "DataItem.LoginID") %></td>
		<td><%# DataBinder.Eval(Container, "DataItem.Fname") %></td>
		<td><%# DataBinder.Eval(Container, "DataItem.LName") %></td>		  
		 </tr>
		</ItemTemplate>		
		<FooterTemplate>
		</table>
		</FooterTemplate> 
		</asp:Repeater>

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Question by:PiedmontHealth
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4 Comments
 
LVL 37

Accepted Solution

by:
samtran0331 earned 200 total points
ID: 20368576
I think what's happening is that when this runs:

table.DefaultView.Sort = "Lname, fname, loginID"
ds.Tables.Add(table)
return ds


yes, you've sorted the defaultview of the table, but what gets added to the ds is still the raw (unsorted) table, not the defaultview.

you can either:
1. make the function return a dataview
or
2. don't sort the table until right before you bind it
0
 

Author Comment

by:PiedmontHealth
ID: 20368727
I see. I have since read about the difference in DataSet and DateView. Makes sense. I changed the custom class to return a dataview of the dataset and in my codebehind, I did this...

        Dim dv As DataView = [RESULTING DATAVIEW FROM THE OBJECT CALL]
        repGrid.DataSource = dv
        repGrid.DataMember = "tblSearchResults"
        repGrid.Visible = True
        dv.Sort = "lname, fname, loginID"
        repGrid.DataBind()
Works like a champ. Thanks! I am slowly but surely getting this .NET stuff. ;)
0
 

Author Closing Comment

by:PiedmontHealth
ID: 31411516
I love this site! I have thrown away my bailing pail!
0
 
LVL 37

Expert Comment

by:samtran0331
ID: 20368813
since your function returns a dv, you can skip the extra "dim dv"

'Dim dv As DataView = [RESULTING DATAVIEW FROM THE OBJECT CALL]
repGrid.DataSource = FunctionThatReturnsADataview

btw, I think I worked with a former co-worker (or guy you replaced)...let's call him "Bob J. The Funny Guy"
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