column chart 如何让COlumn从零开始

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<asp:chart id="Chart1" runat="server" Height="296px" Width="412px" ImageLocation="~/TempImages/ChartPic_#SEQ(300,3)" Palette="BrightPastel" imagetype="Png" BorderDashStyle="Solid" BackSecondaryColor="White" BackGradientStyle="TopBottom" BorderWidth="2" backcolor="#D3DFF0" BorderColor="26, 59, 105">
<legends>
<asp:Legend IsTextAutoFit="False" Name="Default" BackColor="Transparent" Font="Trebuchet MS, 8.25pt, style=Bold"></asp:Legend>
</legends>
<borderskin skinstyle="Emboss"></borderskin>
<series>
<asp:Series Name="Column" BorderColor="180, 26, 59, 105">
<points>
<asp:DataPoint YValues="45" />
<asp:DataPoint YValues="34" />
<asp:DataPoint YValues="67" />
<asp:DataPoint YValues="31" />
<asp:DataPoint YValues="27" />
<asp:DataPoint YValues="87" />
<asp:DataPoint YValues="45" />
<asp:DataPoint YValues="32" />
</points>
</asp:Series>
</series>
<chartareas>
<asp:ChartArea Name="ChartArea1" BorderColor="64, 64, 64, 64" BorderDashStyle="Solid" BackSecondaryColor="White" BackColor="64, 165, 191, 228" ShadowColor="Transparent" BackGradientStyle="TopBottom">
<area3dstyle Rotation="10" perspective="10" Inclination="15" IsRightAngleAxes="False" wallwidth="0" IsClustered="False"></area3dstyle>
<axisy linecolor="64, 64, 64, 64">
<labelstyle font="Trebuchet MS, 8.25pt, style=Bold" />
<majorgrid linecolor="64, 64, 64, 64" />
</axisy>
<axisx linecolor="64, 64, 64, 64">
<labelstyle font="Trebuchet MS, 8.25pt, style=Bold" />
<majorgrid linecolor="64, 64, 64, 64" />
</axisx>
</asp:ChartArea>
</chartareas>
</asp:chart>
如何让<asp:DataPoint YValues="45" />从0开始