Databases
StackOverflow2013
Postsdbo
POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
    primarykey
    data
    text
    <p>I am trying to populate a <code>GridView</code> using Entity Frameworkm but every time I am getting the following error:</p> <blockquote> <p>"Property accessor 'LoanProduct' on object 'COSIS_DAL.MemberLoan' threw the following exception: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection."</p> </blockquote> <p>My code is:</p> <pre><code> public List&lt;MemberLoan&gt; GetAllMembersForLoan(string keyword) { using (CosisEntities db = new CosisEntities()) { IQueryable&lt;MemberLoan&gt; query = db.MemberLoans.OrderByDescending(m =&gt; m.LoanDate); if (!string.IsNullOrEmpty(keyword)) { keyword = keyword.ToLower(); query = query.Where(m =&gt; m.LoanProviderCode.Contains(keyword) || m.MemNo.Contains(keyword) || (!string.IsNullOrEmpty(m.LoanProduct.LoanProductName) &amp;&amp; m.LoanProduct.LoanProductName.ToLower().Contains(keyword)) || m.Membership.MemName.Contains(keyword) || m.GeneralMasterInformation.Description.Contains(keyword) ); } return query.ToList(); } } protected void btnSearch_Click(object sender, ImageClickEventArgs e) { string keyword = txtKeyword.Text.ToLower(); LoanController c = new LoanController(); List&lt;COSIS_DAL.MemberLoan&gt; list = new List&lt;COSIS_DAL.MemberLoan&gt;(); list = c.GetAllMembersForLoan(keyword); if (list.Count &lt;= 0) { lblMsg.Text = "No Records Found"; GridView1.DataSourceID = null; GridView1.DataSource = null; GridView1.DataBind(); } else { lblMsg.Text = ""; GridView1.DataSourceID = null; GridView1.DataSource = list; GridView1.DataBind(); } } </code></pre> <p>The error is mentioning the <code>LoanProductName</code> column of the <code>Gridview</code>. Mentioned: I am using C#, ASP.net, SQL-Server 2008 as back end DB.</p> <p>I am quite new to Entity Framework. I can't understand why I am getting this error. Can anyone help me please?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USErik Philips
    1. USbarsan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
      1. USRup
      1. VTFavorite
    2. VO
      singulars
      1. POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
      1. This table or related slice is empty.
      1. VTUpMod
    1. COAre you accessing any navigation properties in the gridview. If you do, you need to include those navigation tables in the query as well. Like `query.Include("SomeOtherTable")`
      singulars
      1. POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
      1. USNilesh
    2. COTry either creating a proxy class to host your entity or at least return an anonymous object. From my point of view, using ef does require creating proxy classes to implement your logics, use the edmx just as the db access layer not as business.
      singulars
      1. POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
      1. USGonzix
    3. COyes in the gridview I am getting another table column also. Which is LoanProviderName.
      singulars
      1. POSolving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
      1. USbarsan
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload