Best Way to Code

Use an extension method to convert from string to enum.

 public static T ToEnum(this string enumString)
 {
    return (T) Enum.Parse(typeof (T), enumString);
 }

//Usage:

 Color colorEnum = "Red".ToEnum<Color>();

Encoding

  byte[] textAsBytes = System.Text.Encoding.UTF8.GetBytes(text);
  var encodedText = Convert.ToBase64String(plainTextBytes);

Decoding

 var textAsBytes = Convert.FromBase64String(text);
 var decodedText = System.Text.Encoding.UTF8.GetString(textAsBytes);

How to get the raw xml from a webservice request or response

XmlSerializer xmlSerializer = new XmlSerializer(oResponse.GetType());

using (StringWriter textWriter = new StringWriter())
{
    xmlSerializer.Serialize(textWriter, oResponse);
    var xmlText = textWriter.ToString();
}

Fast test way to sum from 1 to 100000 by using arithmetic series.

public static int Sum(int value)
{
 var n = value;
 var a1 = 1;
 var an = a1 + (n - 1);
 var sn = n * (a1 + an) / 2;
 return sn;
}

First Method

        public static int GetWorkingDays(DateTime from, DateTime to)
        {
            var workingDay = 1 + (to - from).Days;
            return Enumerable
                .Range(0, workingDay)
                .Select(x => from.AddDays(x))
                .Count(x => x.DayOfWeek != DayOfWeek.Saturday && x.DayOfWeek != DayOfWeek.Sunday);
        }

Second Method

        public static double GetWorkingDays(DateTime startD, DateTime endD)
        {
            double workingDay = 1 + ((endD - startD).TotalDays * 5 - (startD.DayOfWeek - endD.DayOfWeek) * 2) / 7;

            if (endD.DayOfWeek == DayOfWeek.Saturday) workingDay--;
            if (startD.DayOfWeek == DayOfWeek.Sunday) workingDay--;

            return workingDay;
        }

If your primary key is auto increment

public void InsertOrUpdate(Blog blog) 
{ 
    using (var context = new BloggingContext()) 
    { 
        context.Entry(blog).State = blog.BlogId == 0 ? EntityState.Added : EntityState.Modified;  
        context.SaveChanges(); 
    } 
}

If your primary key is not auto increment

public void InsertOrUpdate(Blog blog) 
{ 
    using (var context = new BloggingContext()) 
    { 
        var q = context.Blog.FirstOrDefault(x=>x.BlogId=blog.BlogId);        
        if (q != null)
            context.Entry(q).State = EntityState.Detached;
        context.Entry(blog).State = q == null ?EntityState.Added : EntityState.Modified; 
        context.SaveChanges(); 
    } 
}

If you want to convert currency string to double, there is a short way to do it.

var value = "($123)";
double.Parse(value, NumberStyles.Currency); //output -123.02

Regex.IsMatch(ddlCustomer.SelectedValue, @"^\d+$")

  <asp:RadioButtonList ID="radFruits" runat="server">
     <asp:ListItem Text="Mango" Value="1" />
     <asp:ListItem Text="Apple" Selected="True" Value="2" />
     <asp:ListItem Text="Banana" Value="3" />
     <asp:ListItem Text="Guava" Value="4" />
  </asp:RadioButtonList>

   var radio = $("[id*=radFruits] input:checked");
   var value = radio.val();