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Finding datatable row index and deleting/removing

Posted on 2009-06-29
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Last Modified: 2013-12-25
Hello - thank you for taking a moment to look at the ASP.NET issue I am having.

I have created a Datatable that has three columns: ID, firstName, lastName. The ID column is the primary key. Not to get too mired in the details, but this datatable acts like a shopping cart (but isn't) where users can select people from a list (provided by a DataList) and those selections are stored in the datatable and displayed in a different area on the same page by a Repeater control. This part seems to be working fine.

A requirement of this project is to be able to REMOVE those people from the datatable. I am doing this by placing an LinkButton within the Repeater that displays the text "REMOVE" - and this is where I am having problems. I have included the code I am trying to use to find the ID of the particular person (row), and then remove/delete it.

When I click the LinkButton in the Repeater control, I am receiving the following ASP.NET error:
System.FormatException: Input string was not in a correct format.

A side-note: I am not an expert programmer by any means, so I appreciate any and all suggestions.
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
 
Dim dt As New DataTable
dt = CType(Session("JohnTable"), DataTable)
 
' Find the ID of the person (row)
Dim rowIndex As Integer
rowIndex = ViewState(CType(Session("JohnTable"), DataTable).Rows.IndexOf(CType(Session("JohnTable"), DataTable).Rows.Find(ID)))
 
'Delete the row
Dim ival As Integer
For ival = 0 To dt.Rows.Count - 1
If dt.Rows(ival).Item("ID") = rowIndex Then
dt.Rows(ival).Delete()
Exit For
End If
Next
 
dt.AcceptChanges()
Me.Repeater1.DataSource = dt
Me.Repeater1.DataBind()
End Sub

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Question by:John0214
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prairiedog earned 2000 total points
ID: 24737290
This is how to get the row index  in your Button click event handler:

Dim lbtn As LinkButton = CType(sender, LinkButton)
Dim item As RepeaterItem = CType(lbtn.NamingContainer, RepeaterItem)
Dim rowIndex As Integer = item.ItemIndex
'Continue your code
 
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Author Comment

by:John0214
ID: 24738172
Prairiedog, you have saved my life!!  You have no idea how stuck I was.

THANK YOU!!

John
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Author Closing Comment

by:John0214
ID: 31597911
Thank you, prairiedog - as I said before, you saved my life on this. "Thanks" is not enough.
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LVL 22

Expert Comment

by:prairiedog
ID: 24739770
Glad I could help.
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