why only 4 or 5 manufacturers are present in left column ?

By default only 4 or 5 manufacturer names appear in the left column and for rest of the manufacturers, customer has to click on "View All"

a) How can i control the number of manufacturers to appear in the left column ?

b) If i want to display all manufacturers in left column, what to do ?

Are you sure that not all of your manufacturers are displayed?

I looked at the code and it looks like all of them should be visible.

Oh yes, sorry my bad, i added only 5 manufacturers and i thought rest of the manufacturers will appear only with the click on "View All" link.

Thank You

Is it possible to display manufacturers in a drop down menu along with view all option instead of displaying all manufacturers in a list ?

You need some custom coding for this.

Look at the code in NopCommerce where there is other drop down lists. Then you will get an idea on how to do it.