datagridview count for person and fruit

Question

I want to know how many types of fruit for Rohim / Karim / Shovan? I can clarify like this:

private void Form1_Load(object sender, EventArgs e)

{

AddRowsInDatagridView("Rohim", "Apple");

AddRowsInDatagridView("Karim", "Banana");

AddRowsInDatagridView("Karim", "Guava");

AddRowsInDatagridView("Rohim", "Coconut");

AddRowsInDatagridView("Karim", "Banana");

AddRowsInDatagridView("Rohim", "Jackfruit");

AddRowsInDatagridView("Rohim", "Apple");

AddRowsInDatagridView("Rohim", "Apple");

AddRowsInDatagridView("Karim", "Guava");

AddRowsInDatagridView("Rohim", "Palm");

AddRowsInDatagridView("Shovan", "Date");

AddRowsInDatagridView("Karim", "Banana");

}

Now my question: How many types of fruit are for Rahim?

Expected Answer : 4

How many types of fruit are for Karim?

Expected Answer : 2

How many types of fruit are for Shovan?

Expected Answer : 1