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I'm not exactly what terminology to even use to look this up, and I figure the best way to explain it is with an example image.

I have a game field made up of 12 (numbered 1-12) slots, 4 wide and 3 deep, I need to be able to take the main slot number hit and get the numbers of its neighboring slots for an Area of Effect system.

Here's one sample implementation, but it may not work depending on how you're storing your data. The first part just creates the array, then the second part asks the user to select a number so we can highlight it and it's neighbors.

All we have to do is check if the current row is within 1 of the selected row, and if the current column is within 1 of the selected column, and hightlight that square (because it'a a neighbor). Of course if both the row and column match, then we highlight that a little differently since that's the number they chose:

private static void Main(string[] args)

 var rowCount = 4;
 var colCount = 3;
 var slots = new int[rowCount, colCount];

 // Populate the grid
 for (int i = 0; i < rowCount * colCount; i++)
 
 var col = i / rowCount;
 var row = i % rowCount;

 slots[row, col] = i + 1;
 

 // Print the grid
 for (int row = 0; row < rowCount; row++)
 
 for (int col = 0; col < colCount; col++)
 
 Console.Write($" slots[row, col]");
 

 Console.WriteLine();
 

 // Ask the user to select a number from the grid
 var chosenNumber = GetIntFromUser("nSelect a number: ", 
 x => x > 0 && x < rowCount * colCount);

 // Get the coordinates of that selected number
 var selCol = (chosenNumber - 1) / 4;
 var selRow = (chosenNumber - 1) % 4;

 // Print the grid, highlighting their 
 // selected number and it's neighbors
 Console.WriteLine();
 for (int row = 0; row < rowCount; row++)
 
 for (int col = 0; col < colCount; col++)
 
 if (row == selRow && col == selCol)
 
 Console.BackgroundColor = ConsoleColor.White;
 Console.ForegroundColor = ConsoleColor.Red;
 
 else if (row >= selRow - 1 && row <= selRow + 1 &&
 col >= selCol - 1 && col <= selCol + 1)
 
 Console.BackgroundColor = ConsoleColor.Gray;
 Console.ForegroundColor = ConsoleColor.Blue;
 
 else
 
 Console.ResetColor();
 

 Console.Write($" slots[row, col]");
 

 Console.WriteLine();
 

 GetKeyFromUser("nDone! Press any key to exit...");

Output

Oh,and the helper function I used to get a valid number is:

private static int GetIntFromUser(string prompt, Func<int, bool> validator = null)

 !(validator?.Invoke(result) ?? true));

 return result;