Add Chart control reference samples to BeforeWebForms

[Copilot]

Creates ASP.NET Web Forms Chart control samples as reference implementations for the future Blazor Chart component.

Samples Added

• Default.aspx - Column chart with axis configuration, styling, and programmatic data points
• PieChart.aspx - Pie chart with custom colors, percentage labels, and legend
• LineChart.aspx - Multi-series line chart demonstrating comparison visualization (solid vs dashed lines, different markers)
• DataBinding.aspx - Bar chart with ObjectDataSource integration using XValueMember/YValueMembers

Example Usage

<asp:Chart ID="Chart1" runat="server" Width="600px" Height="400px">
    <Series>
        <asp:Series Name="Sales" ChartType="Column" 
            Color="SteelBlue" BorderColor="Black" BorderWidth="1">
        </asp:Series>
    </Series>
    <ChartAreas>
        <asp:ChartArea Name="ChartArea1">
            <AxisX Title="Month"><MajorGrid LineColor="LightGray" /></AxisX>
            <AxisY Title="Sales ($)"><MajorGrid LineColor="LightGray" /></AxisY>
        </asp:ChartArea>
    </ChartAreas>
    <Titles>
        <asp:Title Text="Monthly Sales Report" Font="Arial, 14pt, style=Bold" />
    </Titles>
</asp:Chart>

Chart1.Series["Sales"].Points.AddXY("January", 12000);
Chart1.Series["Sales"].Points.AddXY("February", 15000);

Key Features Covered

Chart types (Column, Bar, Line, Pie) · Multiple series · Data binding · Styling · Axis configuration · Legends & titles · Custom labels · Markers

Project Updates

• Added System.Web.DataVisualization assembly reference
• Included all Chart samples in BeforeWebForms.csproj
• Added README documenting Chart control hierarchy and implementation guidance

Warning

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• learn.microsoft.com
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If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create Chart 'Before' samples</issue_title>
<issue_description>Let's find some of the ASP.NET documentation for the Chart control and build those samples on the BeforeWebForms project so that potential contributors can start evaluating an approach to build this control.</issue_description>

<agent_instructions>Create some samples that use the Chart control from ASP.NET Web Forms in the BeforeWebForms project so that we have some references to emulate as we build the Chart component</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Create Chart 'Before' samples #174

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