Rest service: POST method showing error:method not allowed

first upon i would like to say thanks for your reply..here i mentioned my code below please help me to get a solution..

here is the servicecontract
[ServiceContract]
public interface ITestservice
{
[OperationContract]

[WebInvoke(Method="POST",
UriTemplate = "GetData/{value}",
RequestFormat=WebMessageFormat.Json,ResponseFormat=WebMessageFormat.Json)]
string GetData(string value);

}

//**********************************************//
public class Testservice : ITestservice
{

public string GetData(string value)
{

SqlConnection mycon = new SqlConnection("Data Source=HORIZON2-PC\\HORIZON2013;Initial Catalog=SBL;Trusted_Connection=true;");
mycon.Open();
SqlCommand mycmd = new SqlCommand("insert into Books (BookName) values(@name)", mycon);
// mycmd.Parameters.AddWithValue("@id",SqlDbType.Int).Value= value;
mycmd.Parameters.AddWithValue("@name", SqlDbType.VarChar).Value = value;
int x = mycmd.ExecuteNonQuery();
if (x > 0)
{
return "success";
}
else
{
return "failed";
}

}

}