Duvidas em asp.net chart column

<asp:Chart ID=Chart2 runat=server DataSourceID=dsMidiasSemana 
        Height=460px Width=1377px BackColor=Silver Palette=SemiTransparent 
        BackGradientStyle=DiagonalLeft BackImageWrapMode=Scaled>
        <Series>
            <asp:Series Name=Series1 XValueMember=DescMidia YValueMembers=Total_Midia 
                YValuesPerPoint=2 Legend=Legend1 IsValueShownAsLabel=True >
            </asp:Series>
        </Series>
        <ChartAreas>
            <asp:ChartArea Name=ChartArea1 BackColor=#6699FF BackGradientStyle=Center BorderColor=DarkBlue>
            <AxisY Title=Total>
                <MajorGrid Enabled=false />
            </AxisY>
            <AxisX Title=Mídia>
                <MajorGrid Enabled=false />
            </AxisX>
            <Area3DStyle Enable3D=true />
            </asp:ChartArea>
        </ChartAreas>
        <Titles>
            <asp:Title Name=Title1 Text=Mídias - Semana>
            </asp:Title>
        </Titles>
        <BorderSkin SkinStyle=Raised />
    </asp:Chart>
    <asp:SqlDataSource ID=dsMidiasSemana runat=server 
        ConnectionString=<%$ ConnectionStrings:CRMConnectionString %> SelectCommand=SELECT COUNT(*) AS Total_Midia, ISNULL(P.CdMidia,000) AS CdMidia, 
ISNULL(M.DescMidia,SEM MÍDIA) AS DescMidia
FROM PedSai P
LEFT JOIN Tb_Midia M ON (P.CdMidia = M.CdMidia)
WHERE DATEPART(WEEK,P.DtPed) = DATEPART(WEEK,GETDATE())
AND DATEPART(YEAR,P.DtPed) = DATEPART(YEAR,GETDATE())
GROUP BY P.CdMidia, M.DescMidia
ORDER BY M.DescMidia></asp:SqlDataSource>