Button click the selected value is not selected

show us your service is it returning properties name Test1 and Test2. And I am talking about properties not about values.

Not working

the slected item is disapear

my code

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DropDownListCaseType.DataSource = service;

DropDownListCaseType.DataTextField = "Test1";

DropDownListCaseType.DataValueField = "Test2";

DropDownListCaseType.DataBind();

DropDownListCaseType.Items.Insert(0, new ListItem("-Select-", "-1"));

first make sure, your data value field and Text field are set correctly.

2nd fetch value as