how can we one line loop use ?? example counter use 1 to .... how

Question

int counter = 0;

for (int i = 0, loopTo = checkedListBox1.Items.Count - 1; i <= loopTo; i++)

{

if (Conversions.ToBoolean(checkedListBox1.GetItemCheckState(i)))

{

counter = counter + 1;

}

}

if (counter != 1 )

if (counter != 2)

if (counter != 3)

if (counter != 4)

if (counter != 5)

if (counter != 6)

if (counter != 7)

if (counter != 8)

if (counter != 9)

if (counter != 10 )

{

Interaction.MsgBox("Select all Months!!!!!!!!!");

return ;

}

 

 

 

 

how can we one line loop use counter   ??

 example counter use 1 to .... 

how pls tell