Question

am using two datatable named as dnddatatable and dtdup . it contains set of phone numbers . I want to compare 2nd datatable with first datatable and remove the values from datatable1(name as dnddatatable)values which are equal to 2nd datatable name as(dtdup).

data in the datatable as follows.

dnddatatable(data table1)

phone
9865015695
9840903331 
98668625
800971868
809679532
837445478

dtdup(dtata table2)

phone_numbers
9865015695
9840903331 

result dnddatatable(data table1)

98668625
800971868
809679532
837445478 

Answer 1

I answered a pretty similar question time ago, the idea is exactly the same

For i As Integer = 0 To dataset.Tables(0).Rows.Count - 1
        Dim found As Boolean = False
        For j As Integer = 0 To dataset1.Tables(0).Rows.Count - 1
            If dataset.Tables(0).Rows(i)(0).ToString = dataset1.Tables(0).Rows(j)    (0).ToString Then
                found = True
            End If
        Next
        If found = False Then
            'here you are getting the right result in each loop
            'in this example i'm showing the result in a textbox
            'just change the instruction and write them in your note pad or wherever you want to
            MsgBox(dataset.Tables(0).Rows(i)(0).ToString)
        End If
    Next