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Reading from one column in a Dataset

Posted on 2006-06-30
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Last Modified: 2010-04-23
Hi all,

I have a Dataset in my app populated with 10 columns of data. I also have a ComboBox that contains all the names of the columns. What I am trying to achieve is, when a user selects a column name from the ComboBox my app should look at the data in my Dataset from the selected column only and try to find a predefined value. If not found then it should pop up a message box. If all data in the column does match the predefined value then a different message box pops up.

Can someone give me a code example of how to do this as I am having a bit of trouble trying to figure it out.

Many Thanks.
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Question by:kiranboi
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2 Comments
 
LVL 17

Accepted Solution

by:
ZeonFlash earned 500 total points
ID: 17018259
From your description, this is what I came up with:

    Dim objPredefinedValue As Object = "Predefined Value"

    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Dim intMatchesFound As Integer = 0

        For Each row As DataRow In dsDataset.Tables(0).Rows
            If row.Item(ComboBox1.SelectedValue) = objPredefinedValue Then intMatchesFound += 1
        Next

        If intMatchesFound = 0 Then : MsgBox("No match found")
        ElseIf intMatchesFound = dsDataset.Tables(0).Rows.Count Then : MsgBox("All rows match")
        Else : MsgBox(intMatchesFound & " matches found")
        End If
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Author Comment

by:kiranboi
ID: 17018339
Works great, thanks
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