# C# program to multiply two matrices

Here, we are going to learn how to multiply two matrices in C#?
Submitted by Nidhi, on November 02, 2020 [Last updated : March 19, 2023]

## Multiplying Two Matrices

Here, we will read a matrix from the user and then calculate the multiplication of matrices.

## C# code to multiply two matrices

The source code to multiply two matrices is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

```//C# program to multiply two matrices.

using System;

class MatrixDemo
{
public static void Main(string[] args)
{
int i = 0;
int j = 0;

int row     = 2;
int col     = 2;

int[,] Matrix1 = new int[row, col];
int[,] Matrix2 = new int[row, col];
int[,] Matrix3 = new int[row, col];

Console.Write("Enter the elements of matrix1: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
}
}

Console.Write("Enter the elements of matrix2: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
}
}

for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
Matrix3[i, j] = 0;
for (int k = 0; k < 2; k++)
{
Matrix3[i, j] += Matrix1[i, k] * Matrix2[k, j];
}
}
}

Console.WriteLine("\nMatrix1: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
Console.Write(Matrix1[i, j] + "\t");
}
Console.WriteLine();
}

Console.WriteLine("\nMatrix2: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
Console.Write(Matrix2[i, j] + "\t");
}
Console.WriteLine();
}

Console.WriteLine("\nMatrix3: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
Console.Write(Matrix3[i, j] + "\t");
}
Console.WriteLine();
}

}
}
```

## Output

```Enter the elements of matrix1: 1
2
3
4
Enter the elements of matrix2: 5
6
7
8

Matrix1:
1       2
3       4

Matrix2:
5       6
7       8

Matrix3:
19      22
43      50
Press any key to continue . . .
```

## Explanation

In the above program, we created a class MatrixDemo that contains a Main() method. The Main() method is the entry point for the program, Here we created three 2-D arrays to represent a matrix.

```Console.Write("Enter the elements of matrix1: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
}
}

Console.Write("Enter the elements of matrix2: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
}
}
```

In the above code, we read two matrices from the user.

```for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
Matrix3[i, j] = 0;
for (int k = 0; k < 2; k++)
{
Matrix3[i, j] += Matrix1[i, k] * Matrix2[k, j];
}
}
}
```

Here, we calculated the multiplication of Matrix1 and Matrix2 and assigned the result to the Matrix3. After that, we printed all matrices on the console screen.

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