Drop Down List item add in 0 index

ddlCategory.Items.Insert() have two overloads
1- define index,you can define value with item name by (ListItem)
that is the simple code to add item of zero index in drop down list:
    ddlCategory.Items.Insert(0, new ListItem("--Select Category--","0"));
        ddlCategory.SelectedIndex = 0;
2- define index, only allowed to add item name like string

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