How to Disable the button while selecting the items in combobox in C# asp.net -

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how disable button if there aren't selected in combobox? here code have tried 

if (satellitecombobox.items.count > 0) {     displayproductiondatabutton.enabled = false; }

i have tried not working, appreciate of suggestion

first of , should set true autopostback property dropdownlist. after , in selectedindexchange event can use desired code :

if (dropdownlist1.selectedindex < 0)         {             button1.enabled = false;         }         else         {             button1.enabled = true;         }

in code when user doesn't select item , button disabled. or can set first item of dropdownlist value 'choose ...' , change code this,it's better users :

if (dropdownlist1.selectedindex <= 0)             {                 button1.enabled = false;             }             else             {                 button1.enabled = true;             }

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