How to add default value --select-- in combobox in windows application.along with adding datasource.

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Windows

.NET

forms

hI
I have to upload excel data to mysql database throw windows forms application. i put comboboexs to access column names of excel sheet.
i bind all columns to the all comboboxes but i need to insert --select-- in starting of combobox list.
combobox1.DataSource = dt;
combobox1.ValueMember = ORDINAL_POSITION;
combobox1.DisplayMember =COLUMN_NAME;
combobox1.BindingContext = new BindingContext();


up tothis it is fine but i wonts to insert --select-- in starting of list.
i added it by
combobox.Items.Insert(0, new ListItem("Select", "0"));

but it showing error like this u cannot change data once u assign datasource.


how to solve the problem.
please tell me.