DATAREADER Invalid attempt to Read when reader is closed.

Basically im having the error because the datareader is not finding any data to meet the query criteria. So it closes but returns nothing, how do i give back a message saying that there is no data? Code is Below


'This checks the date selected on the calendar and runs a query based on the selection
Sub Button1_Click(sender As Object, e As EventArgs)
    If month(formatdatetime(calendar1.SelectedDate,0)) = month(formatdatetime(system.DateTime.now,0)) or month(formatdatetime(calendar1.selectedDate,0)) > month(formatdatetime(system.DateTime.now,0)) then
    datagrid1.datasource = ""
    datagrid1.databind()
        Label1.text = "Please choose another date, at least a month back"
    Else
    datagrid1.datasource = Select_info(calendar1.selecteddate) ' DATA READER USED HERE
    datagrid1.databind()
        label1.text = "Select the campaign using the select button next to it to view detailed campaign information. You have selected campaign information from " & formatdatetime(Calendar1.SelectedDate,2) & " to " & formatdatetime(system.Datetime.now,2) & "."
    End if
End Sub


THIS IS THE FUNCTION used ABOVE :

    Function Select_info(ByVal datesel As Date) As System.Data.IDataReader
        Dim connectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0; Ole DB Services=-4; Data Source=DATASOURCE
        Dim dbConnection As System.Data.IDbConnection = New System.Data.OleDb.OleDbConnection(connectionString)

        Dim queryString As String = "SQL QUERY where [Start_Dte] >= @datesel) order by start_dte desc"
        Dim dbCommand As System.Data.IDbCommand = New System.Data.OleDb.OleDbCommand
        dbCommand.CommandText = queryString
        dbCommand.Connection = dbConnection

        Dim dbParam_datesel As System.Data.IDataParameter = New System.Data.OleDb.OleDbParameter
        dbParam_datesel.ParameterName = "@datesel"
        dbParam_datesel.Value = datesel
        dbParam_datesel.DbType = System.Data.DbType.DateTime
        dbCommand.Parameters.Add(dbParam_datesel)

        dbConnection.Open
        Dim dataReader As System.Data.IDataReader = dbCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection)
       
        Return dataReader
    End Function

Any help will be appreciated.

Thx
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