how to solve Cannot bind to the new display member parameter

Question

I created a window for along with my lined database while I am started debugging my code it showing error like "Cannot bind to the new display member parameter name: new Display member"...

 

Here is the Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.OleDb;
namespace WindowsFormsApplication5
{
public partial class Form2 : Form
{
DataTable dt = new DataTable();
static string connection = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=F:\\db\\MobileSpec.mdb;";
OleDbConnection conn = new OleDbConnection(connection);
public Form2()
{
InitializeComponent();
}
private void Form2_Load(object sender, EventArgs e)
{
DataTable dtable = new DataTable();
string sql = "select Distinct Price from mobilelist";
DataTable dtable1 = new DataTable();
string sql1 = "select Distinct Storage from mobilelist";
DataTable dtable2 = new DataTable();
string sql2 = "select Distinct Storage from mobilelist";
try
{
conn.Open();
OleDbDataAdapter da = new OleDbDataAdapter(sql, conn);
da.Fill(dtable);
dtable.Columns.Add("select Ram");
comboBox1.DataSource = dtable;
comboBox1.DisplayMember = "Desc";
comboBox1.ValueMember = "Ram";
comboBox1.SelectedValue = "select Ram";
OleDbDataAdapter da1 = new OleDbDataAdapter(sql1, conn);
da1.Fill(dtable1);
dtable1.Columns.Add("select Storage");
comboBox2.DataSource = dtable1;
comboBox2.DisplayMember = "Storage";
comboBox2.ValueMember = "Storage";
comboBox2.SelectedValue = "select Storage";
OleDbDataAdapter da2 = new OleDbDataAdapter(sql2, conn);
da2.Fill(dtable2);
dtable2.Columns.Add("select Battery mAh");
comboBox3.DataSource = dtable2;
comboBox3.DisplayMember = "Battery mAh";
comboBox3.ValueMember = "Battery mAh";
comboBox3.SelectedValue = "select Battery mAh";
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
conn.Close();
}
}
}