I am working in winform and using combobox.

I set the properties of combobox in this sequence

combobox.DisplayMember = "cust_name";
combobox.ValueMember="cust_id";
combobox.datasource=dtCustomer;

I have used combobox in my application several times, I don't know where I am making mistake as

Sometime SelectedItem property returns exact value (int,string) based on the data type of "ValueMember" property, but sometime it returns "DataRowView".

I've read this is because of the sequence in which properties are setting in combobox. But this is not the case now.

Binding code is

Calling code is