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We are binding a DataGridview using BindingSource . So in the main thread we have given like this. class1BindingSource = new BindingSource(); class1BindingSource.DataSource = class1List; this.dataGridView1.DataSource = class1BindingSource; After that i have a placed a background worker in the form and is triggering in a button click. i.e. in the button click this.backgroundWorker1.RunWorkerAsync() In the BackgroundWorker DoWork Event i am trying to update the BindingSource and there by trying to update the DataGridview . So the BindingSource reset is done in a method in another class. DoWork Event Class2 cl2 = new Class2(); cl2.UpdateBindingSource(class1BindingSource); UpdateBindingSource Method public void UpdateBindingSource(BindingSource bs) { Class1 c1 = bs.Current as Class1; for (int i = 0; i < 1000; i++) { lock (bs.SyncRoot) { c1.MyProperty1 = i; bs.ResetItem(0); } } } Now i am getting an exception like BindingSource cannot be its own data source. Do not set the DataSource and DataMember properties to values that refer back to BindingSource . If i am doing this in my DoWork Event then i can reset the item in the control thread itself using BeginInvoke method . But actually i am trying to simulate our application scenario. So i want to solve this in this format. Can any one help me on this.

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