// build out the search parameters
StringBuilder parms = new StringBuilder();
parms.Append("custID|" + tbCustID.Text.Trim() + "%");

ctDynamicsSLCustomers.customers customersService  = new ctDynamicsSLCustomers.customers();
ctDynamicsSLCustomers.ctDynamicsSLHeader cHeader = new ctDynamicsSLCustomers.ctDynamicsSLHeader();
cHeader.licenseExpiration = "myLicenseExpirateDate"; //leave blank if no expiration date;
cHeader.licenseKey = "myLicenseKey";
cHeader.licenseName = "myCompanyName";
cHeader.siteKey = "encryptionKey";
cHeader.siteID = "mySiteID";
cHeader.cpnyID = "mySolomonCpnyID";
cHeader.softwareName = "CTAPI";
customersService.ctDynamicsSLHeaderValue = cHeader;
customersService.Url = "http://localhost/ctDynamicsSL/customers.asmx";

// call the method and retrieve into a dataset
DataSet ds = customersService.getCustomers("", "0", "20", parms.ToString(), "name");