Do you know why to use Entity Framework?

using (SqlConnection conn = new SqlConnection())
{
    conn.ConnectionString = "Data Source=(local);Initial Catalog=Northwind;Integrated Security=True";
    conn.Open();

    SqlCommand cmd = conn.CreateCommand();
    cmd.CommandText = "SELECT * FROM Customers WHERE CompanyName LIKE '" + companyNameTextbox.Text + "%'";

    bindingSource1.DataSource = cmd.ExecuteReader();
}

var results = dbContext.Customers
    .Where(c => c.CompanyName.StartsWith(companyNameTextbox.Text));
customersBindingSource.DataSource = results;

// Or even
var results = dbContext.Customers
    .Where(c => c.CompanyName.StartsWith(companyNameTextbox.Text))
    .Select(c => new
    {
        c.CompanyName,
        c.Phone
    });
customersBindingSource.DataSource = results;