Unable to open excel file on click of link buttons

I am using a checkboxlist control in my application. Each Item of checkbox list should be displayed as linkbutton. On click of this linkbuttons it should open a excel file from a folder in my application. I have generated the linkbuttons of checkboxlist dynamically through the code

checkboxlist1.Items[i].Text =" <a href= '"+checkboxlist1.Items[i].Value
+ "' target='_blank'>"+ checkboxlist1.Items[i].Text +"</a>";

checkboxlist1.Items[i].Value will be containing the path of excel file. 

But on clicking the link button the excel file is not getting opened.

Can anyone help me how to open a excel file on click of link button.


Thanks in Advance...