Cannot have multiple items selected in a dropdownlist.

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C#3.5

ASP.NET4

I have a dropdownlist and i am binding value 1 to 60 and the default value is <--Select--> with value "". I have fired the

OnSelectedIndexChanged

event because of some server side code. When i am going to insert a new recode then it working fine but when i am updating any record then it showing error.

Cannot have multiple items selected in a DropDownList.

What I have tried:

I have tired

ddl.ClearSelection();

ddl.Items.FindByValue("4").Selected = true;

But when i want to view a record it should be in Default Mode.

I have tired to show in default mode by providing the Default value in the place of "4" but it showing the same error.