Interface using in ASP.NET

Interface establishes a contract that guarantee that any implementing class will expose a certain function for example.

public interface IExport
{
        void Export();
}

public class ExcelExporter : IExport
{
        public void Export()
        {
        }
}

public class HtmlExporter : IExport
{
        public void Export()
        {
        }
}

If you had code that that works like this
public IExport GetExporter(ExportFormat format)
{
        switch (format)
        {
                 case ExportFormat.Excel:
                        return new ExcelExporter();
        }
}

Than you can say
GetExporter(ExportFormat.Excel).Export(); and be sure that any class that implemented IExport will be exposing an Export function.

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