Question

class InspectionEquip : DataSet
{
    private readonly SqlConnection CPEC = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());

    public InspectionEquip(string store)
    {
        CPEC.Open();
        SqlCommand comm = new SqlCommand("Select * From Equip3 Where Store = '" + store + "'", CPEC);
        SqlDataAdapter da = new SqlDataAdapter(comm);
        da.Fill(/* What to Put Here? Tried "this" and it just returns blank */);    
        CPEC.Close();
    }
}

Answer 1

You have a problem with your SQL query (no matching data, bad parameter). da.Fill(this) works fine.

If you want proof – swap this SqlCommand line with yours…

SqlCommand comm = new SqlCommand("select * from INFORMATION_SCHEMA.COLUMNS", CPEC);

You should also probably extend DataTable, not DataSet if you only ever plan on storing a single tables results.