Add DivRem() method to C# Math Functions (#7965)

* Add DivRem() method to C# Math Functions

* minor content fixes

* note fix n grammar fix

---------

Author: ylevental

content/c-sharp/concepts/math-functions/terms/divrem/divrem.md

@@ -0,0 +1,97 @@
+---
+Title: '.DivRem()'
+Description: 'Calculates the quotient of two numbers and returns the remainder in an output parameter.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Arithmetic'
+  - 'Methods'
+  - 'Numbers'
+CatalogContent:
+  - 'learn-c-sharp'
+  - 'paths/computer-science'
+---
+
+The **`.DivRem()`** method calculates the quotient of two numbers and returns the remainder in an output parameter. This method is useful when both the quotient and remainder of a division operation are needed.
+
+## Syntax
+
+```pseudo
+public static long DivRem(long dividend, long divisor, out long remainder);
+```
+
+**Parameters:**
+
+- `dividend`: The number to be divided (type `int` or `long`).
+- `divisor`: The number to divide by (type `int` or `long`).
+- `remainder`: An output parameter that receives the remainder (type `int` or `long`).
+
+**Return value:**
+
+The method returns the quotient as an `int` or `long`, depending on the parameter types used.
+
+> **Note:** This method throws a `DivideByZeroException` if the `divisor` is zero.
+
+## Example
+
+The following example demonstrates using the `.DivRem()` method to calculate both quotient and remainder:
+
+```cs
+using System;
+
+public class Example
+{
+  public static void Main()
+  {
+    int dividend = 30;
+    int divisor = 7;
+    int remainder;
+
+    int quotient = Math.DivRem(dividend, divisor, out remainder);
+
+    Console.WriteLine($"Dividend: {dividend}");
+    Console.WriteLine($"Divisor: {divisor}");
+    Console.WriteLine($"Quotient: {quotient}");
+    Console.WriteLine($"Remainder: {remainder}");
+  }
+}
+```
+
+The example above produces the following output:
+
+```shell
+Dividend: 30
+Divisor: 7
+Quotient: 4
+Remainder: 2
+```
+
+## Codebyte Example
+
+The following runnable example shows how `.DivRem()` can be used with different numbers:
+
+```codebyte/csharp
+using System;
+
+public class Program
+{
+  public static void Main()
+  {
+    // Example with positive numbers
+    int remainder1;
+    int quotient1 = Math.DivRem(100, 13, out remainder1);
+    Console.WriteLine($"100 divided by 13 = {quotient1} remainder {remainder1}");
+
+    // Example with larger numbers using long
+    long remainder2;
+    long quotient2 = Math.DivRem(1000000L, 777L, out remainder2);
+    Console.WriteLine($"1000000 divided by 777 = {quotient2} remainder {remainder2}");
+
+    // Example with negative dividend
+    int remainder3;
+    int quotient3 = Math.DivRem(-25, 4, out remainder3);
+    Console.WriteLine($"-25 divided by 4 = {quotient3} remainder {remainder3}");
+  }
+}
+```