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Find the distance between two points

csharp
System.Drawing.Point p = new System.Drawing.Point(13, 14),
p1 = new System.Drawing.Point(10, 10);
double distance = Math.Sqrt(Math.Pow(p1.X - p.X, 2) + Math.Pow(p1.Y - p.Y, 2)));

Zero pad a number

Given the number 42, pad it to 8 characters like 00000042
csharp
string.Format("{0,8:D8}", 42);

Right Space pad a number

Given the number 1024 right pad it to 6 characters "1024  "
csharp
public class NumberRightPadding {
public static void Main() {
string withStringDotFormat = string.Format("{0,-6}", 1024);
string withToStringDotPadRight = 1024.ToString().PadRight(6);
}
}

Format a decimal number

Format the number 7/8 as a decimal with 2 places: 0.88
csharp
public class FormatDecimal {
public static void Main() {
decimal result = decimal.Round( 7 / 8m, 2);
System.Console.WriteLine(result);
}
}

Left Space pad a number

Given the number 73 left pad it to 10 characters "        73"
csharp
public class NumberLeftPadding {
public static void Main() {
string withStringDotFormat = string.Format("{0,10}", 73);
string withToStringDotPadLeft = 73.ToString().PadLeft(10);
}
}

Generate a random integer in a given range

Produce a random integer between 100 and 200 inclusive
csharp
System.Random r = new System.Random();
int random = r.Next(100,201);

Generate a repeatable random number sequence

Initialise a random number generator with a seed and generate five decimal values. Reset the seed and produce the same values.
csharp
using System;

public class RepeatableRandom {
public static void Main() {
var r = new Random(12); // seed is 12

for (int i = 0; i < 5; i++)
Console.WriteLine(r.Next());

r = new Random(12);

for (int i = 0; i < 5; i++)
Console.WriteLine(r.Next());
}
}