Search field schema name using field display name in MS CRM 2011

Here is sample code

private string GetAttributeSchemaName(IOrganizationService _Service, string attributeDisplyName)

{

string attributeSchemaName = null;

try

{

RetrieveEntityRequest req = new RetrieveEntityRequest();

req.RetrieveAsIfPublished = true;

req.LogicalName = "opportunityproduct";

req.EntityFilters = EntityFilters.Attributes;

RetrieveEntityResponse resp = (RetrieveEntityResponse)_Service.Execute(req);

for (int a = 0; a < resp.EntityMetadata.Attributes.Length; a++)

{

if (resp.EntityMetadata.Attributes[a].DisplayName.UserLocalizedLabel != null)

{

if (resp.EntityMetadata.Attributes[a].DisplayName.UserLocalizedLabel.Label.ToLower() == attributeDisplyName.ToLower())

{

attributeSchemaName = resp.EntityMetadata.Attributes[a].LogicalName;

break;

}

}

}

}

catch (Exception ex)

{

throw new InvalidPluginExecutionException(ex.Message);

}

return attributeSchemaName;

}