title: Data field Null CRM 2015 C#
body: <p>My code : </p>
  
  <pre><code>OrganizationServiceProxy service = OrganizationServiceProxy();
              QueryExpression qe = new QueryExpression();
              qe.EntityName = "account";
              qe.ColumnSet = new ColumnSet(new string[]{"accountid","name"});
              DataTable table=new DataTable();
              table.Columns.AddRange(new DataColumn[] { new DataColumn("accountid"), new DataColumn("name") });
              var Compte = service.RetrieveMultiple(qe).Entities.ToList();
              foreach (var item in Compte)
              {                    table.Rows.Add(item.Attributes["accountid"].ToString(), item.Attributes["name"].ToString());
              }
              comboBox1.DataSource = table;
              comboBox1.ValueMember = "accountid";
              comboBox1.DisplayMember = "name";
  </code></pre>
  
  <p>my data is like that :</p>
  
  <pre><code>         +---------------------------------------+---------------+
                      accountid                          name
           +---------------------------------------+---------------+
              87906183-dbbb-4754-afc9-f2cfcab4942d    Lois Wright
              86a9c978-e1dc-40e2-98cd-6b463ded0f2d      Null
              8e242301-6c97-4509-9031-7237c1d7b14e    Wanda Torres
              2704b13c-8900-4216-98ce-6b03a056ed32      Null
              55f0db83-d4a7-426a-ac7a-a113118b9a1f    Howard Woods
           +---------------------------------------+---------------+
  </code></pre>
  
  <p>I get error  <strong>"The given key was not in the dictionary crm"</strong></p>