It needs more [`Using`](https://msdn.microsoft.com/en-us/library/htd05whh.aspx) statements. For example:

    Public Shared Function CheckSecurity(strUserID$, strOperation$, strAppID$) As Boolean
        Try
            Using da As New SqlDataAdapter("dbo.CheckSecurity", ConnString) 
                Dim sc = da.SelectCommand, p = sc.Parameters, dt = New DataTable
                sc.CommandType = CommandType.StoredProcedure
                sc.CommandTimeout = m_iSQLTimeOut

                p.Add("@UserID", SqlDbType.VarChar, 15).Value = strUserID
                p.Add("@AppID", SqlDbType.VarChar, 50).Value = strAppID
                p.Add("@Operation", SqlDbType.VarChar, 50).Value = strOperation

                Return da.Fill(dt) > 0     ' .Fill returns the number of rows successfully added
            End Using           ' da is disposed here even if Exception occurs
        Catch ex As Exception
            Throw New ApplicationException("SECURITY ACCESS ERROR")
        End Try
        Return False
    End Function

or 

    Public Shared Function CheckSecurity(strUserID$, strOperation$, strAppID$) As Boolean
        Try
            Using con = New SqlConnection(ConnString), 
                  cmd = New SqlCommand("dbo.CheckSecurity", con)

                cmd.CommandType = CommandType.StoredProcedure
                cmd.CommandTimeout = m_iSQLTimeOut

                cmd.Parameters.Add("@UserID", SqlDbType.VarChar, 15).Value = strUserID
                cmd.Parameters.Add("@AppID", SqlDbType.VarChar, 50).Value = strAppID
                cmd.Parameters.Add("@Operation", SqlDbType.VarChar, 50).Value = strOperation

                con.Open()
                Using reader = cmd.ExecuteReader
                    Return reader.HasRows
                End Using
            End Using       ' con and cmd are closed and disposed here even if Exception occurs
        Catch ex As Exception
            Throw New ApplicationException("SECURITY ACCESS ERROR")
        End Try
        Return False
    End Function

Some other examples http://stackoverflow.com/questions/24023575/how-to-pass-parameters-to-sqldataadapter, http://stackoverflow.com/questions/14566980/c-sharp-data-adapter-parameters