ADO.NET DataTable Select Row if Found Get ID



ID        value1      value2           value3
1          10             29                 1
2          30             32                 3
3          34             45                 5

When User passes a value like for eg :   24  (program should check in what range it lies ie value1= value2  and output the corresponding value of value3

considering 24  it lies inbetween 10-29 (value1-value2) so it should show value3 value which is 1

for this I had written code which returns a dataTable. But I am not able to figure out how we can return the value3 value  using

Here is the code

Dim cnn As New SqlClient.SqlConnection

          dim x as integer = 24  'hardcoded to test
        Dim dt As New DataTable

        Dim strsql As String

        cnn.ConnectionString = "Persist Security Info=False;Integrated Security=SSPI;database=test;server=LOGO"
        Dim SQLAdapter As SqlClient.SqlDataAdapter = New SqlClient.SqlDataAdapter("select * from tbl_values", cnn)

        Dim dr As DataRow()
           dr ="value1<=x  and x<=value2)  

       IF FOUND WE need to get the corresponding value in value3 column / If not found just display message.

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YOu can perform search on datatatble. The only condition - the dat must have key

Dim dr As DataRow = dt.Rows.Find(Value of the key)' ID of ths range
'get the value value in one of the fields

let me know if need to know how to set the key
A more concise method would be to use a DataView.  A DataView is a subset of the data, and is basically defined by passing a filter, sort order and or rowstate.  In the case of your data, a simple filter should result in just one row retunred.  

As an example, use the following after your " SQLAdapter.Fill(dt)" line:
        Dim value3 As Integer 'Something to hold the value in

        Dim dv As New DataView(dt)
        dv.RowFilter = "value1 <= x and value2 >= x"

        If dv.Count = 0 Then 'Not found
            'do something if not found
            MessageBox.Show("Not found in range...")
            value3 = CType(dv.Item(0)("value3"), Integer) 'A dataview acts much like a datatable - but has items instead of rows.
            'Do something with value3...
        End If

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Hi sainavya1215,

i think you are in the correct way , but you use Select methond incorrectly

try this

dr ="value1<=" & x & " and " & x & "<=value2")  

if dr is nothing then
'display error message
'display dr("value3")
end if

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sainavya1215Author Commented:
Thanks Lucutah / mmarinov.

I used Dataview and DataTable Select methods ..Works fine.

When we used   datview.RowFilter or Statements without looping how is it able to find the search range specified.
could u pls explain .......

Thx once again for all the efforts.
do you mean how to find out the number of the founded records ?

sainavya1215Author Commented:
i mean when we use dr ="value1<=" & x & " and " & x & "<=value2")  
internally does it loop and check for the specific record
unfortunatelly i can not answer you at this question because i don't know, but i found long time ago that it is 3-4 times faster than the normal loo for huge tables so may be it is not looping through every records

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