String.format used

 Dim DbinsRow = tempTable.Select(String.Format("[RankID]='{0}' ", ddlRankId))
 For indexRow = 0 To DbinsRow.Length - 1
                                Dim MainTableRow = mainCrewTable.NewRow() ' Main Table row generated
                                MainTableRow("ID") = DbinsRow(indexRow)("ID")
Next
Dim mainRow = mainTable.Select(String.Format("EmployeeID={0} AND WorkMonth='{1}' AND WorkYear='{2}'", cmbEmployeeSelectedValue, cmbMonth.SelectedItem.ToString(), cmbYear.SelectedItem.ToString()))