How To Disable Textboxes in EditItemTamplate of Gridview

Dear I have a gridview and i have 7 columns all have edit item template in which i have placed a textbox for each one on gridview edit i have to update some of the values from all these seven textboxes but based on some other value condidtion i have  a count template field and based on the value of that count i have to disable and enable any of the textboxes based on condition ,I wrote an example of Row_Databound as well as in Gridview perrender it is  not doing the right job.