Load data asynchronously into DataTable in Windows Forms

Question

I\'m modifying the data access layer of an old WinForms/ADO app to get Salesforce objects using soql over the asynchronous developerforce rest api. The following approach

Answer 1

You can have an async method which returns Task<DataTable> and then in async form Load event handler or in the async method which you want to perform data-binding, await call it, then use the result to bind to the grid.

Example

public async Task<DataTable> GetDataAsync(string command, string connection)
{
    var dt = new DataTable();
    using (var da = new SqlDataAdapter(command, connection))
        await Task.Run(() => da.Fill(dt));
    return dt;
}

private async void Form1_Load(object sender, EventArgs e)
{
    var command = @"SELECT * FROM Category";
    var connection = @"Your Connection String";
    var data = await GetDataAsync(command, connection);
    this.dataGridView1.DataSource = data;
}

To see how you can show a loading animation over the DataGridView, take a look at this post.