Updating DataGridView after changing data source during run-time

Question

public void sortAssets(string assetType)
    {
        DataTable newDataTable = new DataTable();
        foreach(DataRow row in table.Rows)
        {
            if ((string)row["assetType"] == assetType)
            {
                string test = (string)row["assetType"];
                newDataTable.ImportRow(row);
            }
        }
        dataGridViewAssets.DataSource = null;
        dataGridViewAssets.DataSource = newDataTable;
        dataGridViewAssets.Refresh();
    }

Above is a piece of code extracted from a program I'm working on. I want to change the data-source to newDataTable at runtime. To do that, I have first cleared the the datagridview using dataGridViewAssets.DataSource = null; . Then, I changed the data source ( dataGridViewAssets.DataSource = newDataTable; ). At last, I refreshed the datagridview by dataGridViewAssets.Refresh(); .

However, the visual datagridview does not get updated. Instead, all data in it get erased and remains blank.

What is wrong here and what must be changed?

Answer 1

Unless you specifically need to clone rows, this would be a lot simpler:

public void FilterAssets(string assetType) {
  (dataGridViewAssets.DataSource as DataTable).DefaultView.RowFilter = "$[assetType] = '{assetType}'";
}

If you've made your DGV based on a bindingsource, it's

public void FilterAssets(string assetType) {
  (dataGridViewAssets.DataSource as BindingSource).Filter = "$[assetType] = '{assetType}'";
}