How to Effectively Filter a DataGridView Bound to a DataSet via DataMember?

DataGridView data manipulation: efficient filtering method

There are multiple methods to choose from to filter the data displayed in the DataGridView without modifying the underlying data source of the DataGridView, depending on the data source type. While filtering a DataTable directly through its default view is straightforward, filtering through a DataMember bound to a DataSet is more challenging.

Scenario 1: Directly filter DataTable

When the DataSource of DataGridView is directly set to DataTable, filtering can be implemented by modifying the DefaultView.RowFilter property of DataTable. This method works because the DataTable is bound directly to the DataGridView, allowing direct manipulation of its data.

Scenario 2: Filter the DataTable bound to BindingSource

If the DataSource of the DataGridView is a BindingSource, and the DataSource of the BindingSource is a DataTable, filtering can be performed by modifying the BindingSource.Filter property. This method works because the BindingSource acts as an intermediary between the DataTable and the DataGridView, allowing filtering without modifying the DataTable itself.

Scenario 3: Bind DataTable to DataSet through DataMember

Filtering becomes more complex when the DataSource of the DataGridView is a DataSet and the DataMember is set to the DataTable name. The key difference is that the DataGridView is not bound directly to the DataTable, but to the DataTable within the DataSet.

Reasons for filtering failure in scenario three

In this case, trying to filter ds.Tables[0].DefaultView.RowFilter will not update the DataGridView because the DataGridView is not directly bound to the DataTable. It is bound to DataSet and DataMember. Modifications to the DataTable's DefaultView are not reflected in the DataGridView because the DataGridView is not aware of the changes.

Solution: Filter the DataView and bind it to the DataGridView

To solve this problem, create a DataView based on the DataTable, apply the filter to the DataView, and set the DataGridView's DataSource to the DataView. This approach preserves the original DataSet and allows filtering without changing the DataGridView's DataSource.

Code Example

<code class="language-csharp">private void textBox1_TextChanged(object sender, EventArgs e)
{
    DataView dv = ds.Tables[0].DefaultView;
    dv.RowFilter = string.Format("Field = '{0}'", textBoxFilter.Text);
    dataGridViewFields.DataSource = dv;
}</code>

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