Could you try this and see if it works out for you?
(From row In dt_sampleData.AsEnumerable()
Let ck1 = If(row("Cusname").ToString.Trim.ToLower.Equals(row("Name1").ToString.Trim.ToLower),"TRUE","FALSE")
Let ck2 = If(row("Cusname").ToString.Trim.ToLower.Equals(row("Name2").ToString.Trim.ToLower),"TRUE","FALSE")
Let ra = new object(){row(0),row(1),row(2),ck1,ck2,row(5)}
Select dt_result.Rows.Add(ra)).CopyToDataTable()