Question

I am binding a data table to combobox like as i show in code below .

        objComboBox.ItemsSource = objDataTableNew.DefaultView;
        objComboBox.DisplayMemberPath = objDataTableNew.Columns[0].ToString();
        objComboBox.SelectedValuePath = objDataTableNew.Columns[1].ToString();
        objComboBox.SelectedIndex = 0;

Now i want to add combo box item with display text as “select” and value as “-1” to the top of the list .
Directly i cant add since itemsource is bound with data table.
I tried inserting a row to objDataTableNew at index zero . but i am having a prob . 0th column of datatable obtained from DB is a integer column. So i cant insert a string value “select” to that column .

How do i achieve this ?

Answer 1

            List<KeyValuePair<string, string>> list = new List<KeyValuePair<string, string>>(objDataTable.Rows.Cast<DataRow>().Select(row => new KeyValuePair<string, string>(row[DisplayMemberColumn].ToString(), row[SelectedValueColumn].ToString())));
            list.Insert(0, new KeyValuePair<string, string>("<--Select-->", "-1"));
            objComboBox.ItemsSource = list;
            objComboBox.DisplayMemberPath = "Key";
            objComboBox.SelectedValuePath = "Value";
            objComboBox.SelectedIndex = 0;