• IService File: This is the interface where the WCF service attributes are applied. In this file you place the definitions of data contract methods/operations.
• Service File: This file is inherited from IService interface file and includes the implementations of defined interface's data contract methods/operations. 
• Application Configuration File: In this file, you place the definitions of secure HTTP binding, endpoints of services and other important features.

/// <summary>
/// Get months difference between two dates
/// </summary>
/// <param name="from">from date</param>
/// <param name="to">to date</param>
/// <returns>months (double) between </returns>
internal static double GetMonths(DateTime from, DateTime to)
{
	/// |-------X----|---------------|---------------|--X-----------|
	///         ^                                       ^
	///       from                                     to

	//change the dates if to is before from
	if (to.Ticks < from.Ticks)
	{
		DateTime temp = from;
		from = to;
		to = temp;
	}

	/// Gets the day percentage of the months = 0...1
	///
	/// 0            1                               0              1
	/// |-------X----|---------------|---------------|--X-----------|
	/// ^^^^^^^^^                                    ^^^^
	/// percFrom                                    percTo
	double percFrom = (double)from.Day / DateTime.DaysInMonth(from.Year, from.Month);
	double percTo = (double)to.Day / DateTime.DaysInMonth(to.Year, to.Month);

	/// get the amount of months between the two dates based on day one
	/// 
	/// |-------X----|---------------|---------------|--X-----------|
	

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using System.Collections.Generic;

namespace ExplicitInterfacesSite
{
    // Simple interface for Vendor class
    public interface IVendor
    {
        // Return the list of vendor names
        List<string> GetData();
    }

    // Simple interface for customer class
    public interface ICustomer
    {
        // Return the list of  customer names.
        // This function name is conflicting with 

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Summary:

Introduction:

 void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs  e)

        {

            if (e.ColumnIndex == -1 && e.RowIndex > -1)

            {

                e.PaintBackground(e.CellBounds,true);

                using (SolidBrush br = new SolidBrush(Color.Black))

                {

                    StringFormat sf = new StringFormat();

                    sf.Alignment = StringAlignment.Center;

                    sf.LineAlignment = StringAlignment.Center;

                    e.Graphics.DrawString(e.RowIndex.ToString(),

                        e.CellStyle.Font, br, e.CellBounds, sf);

                }

                e.Handled = true;

            }

        }

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