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C# | Finding the index of last element in the array

Last Updated : 11 Jul, 2025

is used to find the index of the last element of the specified dimension in the array.

public int GetUpperBound (int dimension);

Here,

is a zero-based dimension of the array whose upper bound needs to be determined.

The return type of this method is

. This method returns the index of the last element of the specified dimension in the array Or -1 if the specified dimension is empty.

This method will give

if the value of

is less than zero, or equal or greater than

.

returns the last index in the first dimension of the array, and

returns the last index of the last dimension of the array. This method is an O(1) operation. Below programs illustrate the use of

:

// C# program to illustrate the GetUpperBound(Int32)
// method in 1-D array
using System;

public class GFG {
    
    // Main method
    static public void Main()
    {

        // 1-D Array
        int[] value = {1, 2, 3, 4, 5, 6, 7};

        // Get the index of the last element
        // in the given Array by using 
        // GetUpperBound(Int32) method
        int myvalue = value.GetUpperBound(0);
        
        Console.WriteLine("Index: {0}", myvalue);
    }
}

// C# program to find last index 
// value and rank of 2-D array
using System;

public class GFG {
    
    // Main method
    static public void Main()
    {

        // 2-D char Array
        char[, ] value = { { 'a', 'b' }, { 'c', 'd' }, 
                           { 'e', 'f' }, { 'g', 'h' },
                                       { 'i', 'j' } };

        // Get the index of the last element
        // and the rank of the given Array
        int myvalue = value.GetUpperBound(0);
        Console.WriteLine("Dimension: {0}", value.Rank);
        Console.WriteLine("Index: {0}", myvalue);
    }
}

Dimension: 2
Index: 4

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