Use server.MapPath in a C# class

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;

public partial class chart : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        String pathChartFile = Server.MapPath("~/public/images/chart.png");

		// Other code ...
	}
	
	// Other methods ...
}

using System;
using System.Web;

/// <summary>
/// This class is used for managing graphs and chart
/// </summary>
public class Chart
{
    public Chart()
	{
        String pathChartFile = HttpContext.Current.Server.MapPath("~/public/images/chart.png");
        // Other code ...
	}

    // Other methods ...
}

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