hi , i want to print the gridview . it is printed using javascript even if i the layout is in landscape, but always in portrain. Now i want to automaticallay print the gridview in landscape when user click the print button. thanks in advance.

 Can you show me the code you are using right now to print?

 I am sure if this is something doable. From all that I have read, the answswer is no.

i am using following javascript to print

 function print() {

            //open new window set the height and width =0,set windows position at bottom

            var a = window.open('', '', 'left =' + screen.width + ',top=' + screen.height + ',width=0,height=0,toolbar=0,scrollbars=0,status=0');

            //write gridview data into newly open window

            // a.document.write(document.getElementById('<%= grdBacteriology.ClientID %>').innerHTML);

            a.document.write(document.getElementById('Gridview-container').innerHTML);

            a.document.close();

            a.focus();

            //call print

            a.print();

            a.close();

            return false;

        }

I dont think that it will be possible. You may try to use some css styles:

http://www.w3.org/TR/2004/CR-css-print-20040225/#section-properties

 how to use the css

There are various pages that describe how to do that. It all depends on your requirements. I suggest that you google for "css print" to find more information.