C#

static bool AreEqual(string str1, string str2)
{
    var compareInfo = CultureInfo.InvariantCulture.CompareInfo;
    bool result = compareInfo.IndexOf(str1, str2, CompareOptions.IgnoreNonSpace) > -1;
    return result;
}

bool compare1 = AreEqual("آبی","آبی");  //true, It's Okay.
bool compare2 = AreEqual("آبی", "ابی"); //true. It's Okay.
bool compare3 = AreEqual("آبی", "آب‌ی"); //true. This is not what I want. It should return false
bool compare4 = AreEqual("آبی", "اب‌ی"); //true. This is not what I want. It should return false.

XDocument doc = XDocument.Load(@"C:\Work\stores.xml");

            var xpath = "//store/Color[text()]" + textBox2.Text;

            var result = ((IEnumerable)doc.XPathEvaluate(xpath)).Cast<XElement>().FirstOrDefault();
            textBox1.Text = result.Value;

<pre><stores>
	<store rollNumer="170">
	    <Name>Jonh</Name>
            <Color>Pink</Color>
	    <Sell>Sugar</Sell>
	</store>

	<store rollNumer="120">
	    <Name>Tedy</Name>
            <Color>Brown</Color>
	    <Sell>Rice</Sell>
	</store>

</stores>

var query = (from r1 in dtMappedSectionNotEmpty.AsEnumerable()
                                 join r2 in dtData.AsEnumerable()
                                 on r1.Field<string>("Row").Trim().ToUpper() equals r2.Field<string>("RowCoordinate").Trim().ToUpper()
                                 join r3 in _Periods.AsEnumerable()
                                 on r2.Field<string>("StandardDate").Replace("A", string.Empty).Replace("E", string.Empty).Trim().ToUpper() equals r3.Replace("A", string.Empty).Replace("E", string.Empty).Trim().ToUpper()
                                 where r1.Field<string>("Tab").Trim().ToUpper() == strTab.Trim().ToUpper()
                                 select new BrokerData
                                 {
                                     RowNumber = r1.Field<string>("Row") ?? "0",
                                     TabName = r1.Field<string>("Matched Section") ?? "",
                                     StandardDate = r3.ToString(),
                                     BRTab = r1.Field<string>("Tab") ?? "",
                                     BRLineItem = r1.Field<string>("Broker Items") ?? "",
                                     Action = r1.Field<string>("Action") ?? "",
                                     StandardLineItem = r1.Field<string>("Matched Items") ?? "",
                                     StandardValue =r2.Field<string>("LineItemDateValue") ?? ""
                                 }).ToList();

using System;
using System.Globalization;

namespace _1002
{
    class Program
    {
        static void Main(string[] args)
        {
            double R = Convert.ToDouble(Console.ReadLine());
            double A = Math.PI * Math.Pow(R, R);
            Console.WriteLine("A = " +A.ToString("F4",CultureInfo.InvariantCulture));
           // Console.ReadLine();
        }
    }
}

I made from a database get and created in HDD. But how to read by axAcroPDF1.src (Adobe Reader)

using System;

namespace test_cs
{
    class Program
    {
        static double calc(double n, double m)
        {
            return (n * m);
        }

        static void Main(string[] args)
        {
            Console.WriteLine("Welcome to calculator 1.0");
            Console.Write("Enter calculations:");
            double num1, num2;
            char oper;
            num1 = Convert.ToInt32(Console.Read());
            oper = Convert.ToChar(Console.Read());
            num2 = Convert.ToInt32(Console.Read());

            Console.WriteLine("{0} {1} {2}", num1, oper, num2);
            Console.ReadLine();
            Console.ReadLine();
        }

    }
}

std::cin >> num1 >> oper >> num2;