Question

Design class which is generated by C# :

    // 
    // usepurposeComboBox
    // 
    this.usepurposeComboBox.DataSource = this.usepurposeBindingSource;
    this.usepurposeComboBox.DisplayMember = "Name";
    this.usepurposeComboBox.FormattingEnabled = true;
    this.usepurposeComboBox.Location = new System.Drawing.Point(277, 53);
    this.usepurposeComboBox.Name = "usepurposeComboBox";
    this.usepurposeComboBox.Size = new System.Drawing.Size(218, 21);
    this.usepurposeComboBox.TabIndex = 4;
    this.usepurposeComboBox.ValueMember = "id";
    // 
    // usepurposeBindingSource
    // 
    this.usepurposeBindingSource.DataSource = typeof(mydatabaseEntities.usepurpose);

Then I bound the BindingSource (usepurposeBindingSource) to Entities :

usepurposeBindingSource.DataSource = mydatabaseEntities.usepurposes;

And I can not add a new row to usepurposeComboBox because it’s been bound. Is there a workaround ?

Answer 1

I resolved it on my own. I created a new unbound combobox then bind it to a datatable. Not sure if it’s the best way but it works for me. Thanks for all of your suggestions. 🙂

private void FillCombobox()
        {
            using (mydatabaseEntities mydatabaseEntities = new mydatabaseEntities())
            {
                List<usepurpose> usepurposes = mydatabaseEntities.usepurposes.ToList();              
                DataTable dt = new DataTable();
                dt.Columns.Add("id");
                dt.Columns.Add("Name");
                dt.Rows.Add(-1, "test row");
                foreach (usepurpose usepurpose in usepurposes)
                {
                    dt.Rows.Add(usepurpose.id, usepurpose.Name);
                }
                usepurposeComboBox.ValueMember = dt.Columns[0].ColumnName;
                usepurposeComboBox.DisplayMember = dt.Columns[1].ColumnName;
                usepurposeComboBox.DataSource = dt;
            }
        }