Question

I have a simple DataTable where one of the columns contains unique values. For example:

ColumnName1   ColumnName2
value1        35
value2        44
value3        10

Because I know that value 1, 2 and 3 will always be different one from another, I would like to get a value of this table only using ColumnName2 and one of the values of ColumnName1.
That would for example be:

searchedValue = DataTable.Rows("value3").Item("ColumnName2) 
'result would be 10

I tried the following examples unsuccessfully:

• with the DataTable.Select method: returns an array of rows, but I only need one

• with the DataTable.Rows.IndexOf method: if I understood well, I need to provide the whole row contents for it to be found with this method.

Answer 1

Dim rows() AS DataRow = DataTable.Select("ColumnName1 = 'value3'")
If rows.Count > 0 Then
     searchedValue = rows(0).Item("ColumnName2") 
End If

With FirstOrDefault:

Dim row AS DataRow = DataTable.Select("ColumnName1 = 'value3'").FirstOrDefault()
If Not row Is Nothing Then
     searchedValue = row.Item("ColumnName2") 
End If

In C#:

var row = DataTable.Select("ColumnName1 = 'value3'").FirstOrDefault();
if (row != null)
     searchedValue = row["ColumnName2"];