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POerror:The ObjectContext instance has been disposed and can no longer be used for operations that require a connection
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  1. POerror:The ObjectContext instance has been disposed and can no longer be used for operations that require a connection
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    copied!<p>i have a listbox and when i select an item from this listbox called as ListofKBrands1, i take this error message:</p> <blockquote> <p>The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.</p> </blockquote> <p>In code-behind,place of this error:</p> <pre><code>if (co.Company != null) </code></pre> <p>my code:</p> <pre><code>private void ListofKBrands1_SelectionChanged(object sender, SelectionChangedEventArgs e) { RSPDbContext c = new RSPDbContext(); if (ListofKBrands1.SelectedItem != null) { ListBoxItem item = ListofKBrands1.SelectedItem as ListBoxItem; KBrand co = item.Tag as KBrand; if (ListofKBrands1.SelectedItem != null) txtNewKBrand.Text = co.Name; else txtNewKBrand.Text = ""; int count = 0; if (co.Company != null) { foreach (string a in cbCompany.Items) { if (a == co.Company.Name) cbCompany.SelectedIndex = count; count++; } } else cbCompany.SelectedIndex = 0; } } </code></pre> <p>before error:</p> <p><img src="https://i.stack.imgur.com/Cz3gu.png" alt="enter image description here"></p> <p>my KBrand.cs:</p> <pre><code>public class KBrand { [Key] public int Id { get; set; } public String Name { get; set; } public virtual Company Company { get; set; } public override string ToString() { return Name; } } </code></pre> <p>company.cs:</p> <pre><code>public class Company { [Key] public int Id { get; set; } public String Name { get; set; } public override string ToString() { return Name; } } </code></pre> <p>if company of selected KBrand is null, this error does not appear. but if company of selected KBrand is not null, i take this error.how can i fix this error ? thanks in advance.</p>
 

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