a bit of SharePoint CSOM code

doesVendorRecExist.cs

private bool doesVendorRecExist(string companyCode, string vendorNum, 
    List vendorList, ClientContext cc)
{
    CamlQuery spq = new CamlQuery();
    spq.ViewXml = string.Format(@"
    <View><Query>
    <Where><And>
    <Eq><FieldRef Name='VendorNo' /><Value Type='Text'>{0}</Value></Eq>
    <Eq><FieldRef Name='CompanyName' /><Value Type='Text'>{1}</Value></Eq>
    </And></Where>
    </Query></View>", vendorNum, companyCode);
    ListItemCollection myItems = vendorList.GetItems(spq);
    cc.Load(myItems);
    try
    {
        cc.ExecuteQuery();
    }
    catch (Microsoft.SharePoint.Client.ServerException ex)
    {
        Console.WriteLine("Error in doesVendorRecExist({0},{1}): {2}", companyCode, vendorNum, ex.Message);
        Environment.Exit(-1);
    }
    return (myItems.Count > 0);
}