I am not sure, what exact output you want. but you can try these solutions:
string Text = ComboBox1.Text;
Or you can use
int Index = ComboBox1.SelectedIndex;
sttring text = ComboBox1.Items[Index].ToString;
OR
DataRow selectedDataRow = ((DataRowView)comboBox1.SelectedItem).Row;
int Id = Convert.ToInt32(selectedDataRow["Id"]);
string Name = selectedDataRow["Name"].ToString();
int selectedValue = Convert.ToInt32(comboBox1.SelectedValue);