swap code c#

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C#

how can i make swap between 2 buttons that contain images
p.s. i made 2 array 2D "memory game"
i put 24 buttons that contain different pictures and above them another 24 buttons that contain "Question mark picture"

System.Windows.Forms.Button[,] m = new
System.Windows.Forms.Button[4, 6];
m[0, 0] = b1;
m[0, 1] = b2;
m[0, 2] = b3;
m[0, 3] = b4;
m[0, 4] = b5;
m[0, 5] = b6;
m[1, 0] = b7;
m[1, 1] = b8;
m[1, 2] = b9;
m[1, 3] = b9;
m[1, 4] = b11;
m[1, 5] = b12;
m[2, 0] = b13;
m[2, 1] = b14;
m[2, 2] = b15;
m[2, 3] = b16;
m[2, 4] = b17;
m[2, 5] = b18;
m[3, 0] = b19;
m[3, 1] = b20;
m[3, 2] = b21;
m[3, 3] = b22;
m[3, 4] = b23;
m[3, 5] = b24;

"buttons that above"

System.Windows.Forms.Button[,] n = new
System.Windows.Forms.Button[4, 6];
n[0, 0] = bt1;
n[0, 1] = bt2;
n[0, 2] = bt3;
n[0, 3] = bt4;
n[0, 4] = bt5;
n[0, 5] = bt6;
n[1, 0] = bt7;
n[1, 1] = bt8;
n[1, 2] = bt9;
n[1, 3] = bt9;
n[1, 4] = bt11;
n[1, 5] = bt12;
n[2, 0] = bt13;
n[2, 1] = bt14;
n[2, 2] = bt15;
n[2, 3] = bt16;
n[2, 4] = bt17;
n[2, 5] = bt18;
n[3, 0] = bt19;
n[3, 1] = bt20;
n[3, 2] = bt21;
n[3, 3] = bt22;
n[3, 4] = bt23;
n[3, 5] = bt24;