How to update textboxes' values in a specific form on Crm 4.0? - dynamics-crm-4

Question

I want to update my account's datas.How can I access and update it ?
I can create a new account using this code but also i want to update :
private static CrmService ConnectToCrm()
{
CrmService service = new CrmService();
CrmAuthenticationToken token = new CrmAuthenticationToken();
token.AuthenticationType = 0;
token.OrganizationName = "crm";
service.Url = "http://192.168.1.23:5555/mscrmservices/2007/crmservice.asmx";
service.CrmAuthenticationTokenValue = token;
service.Credentials = new System.Net.NetworkCredential("username", "password", "domain");
return service;
}
protected void btnUpdateAccount_Click(object sender, EventArgs e)
{
try
{
CrmService MyService = ConnectToCrm();
DynamicEntity leadEntity = new DynamicEntity();
leadEntity.Name = EntityName.lead.ToString();
ArrayList arrProps = new ArrayList();
if (txtName.Text != string.Empty)
{
StringProperty firstname = new StringProperty();
firstname.Name = "firstname";
firstname.Value = txtName.Text;
arrProps.Add(firstname);
}
if (txtSurname.Text != string.Empty)
{
StringProperty lastname = new StringProperty();
lastname.Name = "lastname";
lastname.Value = txtSurname.Text;
arrProps.Add(lastname);
}
if (txtMail.Text != string.Empty)
{
StringProperty mail = new StringProperty();
mail.Name = "emailaddress1";
mail.Value = txtMail.Text;
arrProps.Add(mail);
}
if (txtState.Text != string.Empty)
{
StringProperty state = new StringProperty();
state.Name = "address1_stateorprovince";
state.Value = txtState.Text;
arrProps.Add(state);
}
leadEntity.Properties = (Property[])arrProps.ToArray(typeof(Property));
MyService.Create(leadEntity);
}

Answer 1

Updates work very similar to Creates. Just make sure that the DynamicEntity has the GUID and entity name of the record you want to update and replace
MyService.Create(leadEntity);
with
MyService.Update(LeadEntity);