Re-Open Lost Opportunity in MS CRM 2011 using C#

Here is same code

try

{

OrganizationRequest _request = new OrganizationRequest();

_request.RequestName = "SetState";

_request.Parameters = new Microsoft.Xrm.Sdk.ParameterCollection();

_request.Parameters.Add(new KeyValuePair<string, object>("EntityMoniker", new EntityReference() { Id = _ID, LogicalName = "opportunity" }));

_request.Parameters.Add(new KeyValuePair<string, object>("Status", new OptionSetValue() { Value = 1 }));

_request.Parameters.Add(new KeyValuePair<string, object>("State", new OptionSetValue() { Value = 0 }));

_Service.Execute(_request);

}

catch (Exception _ex)

{

throw _ex;

}