Sql Filestream Access Denied Error

WrapperImpersonationContext context = new WrapperImpersonationContext(System.Environment.MachineName, "guest", "");
                        context.Enter();

              SqlConnection sqlConnection2 = new SqlConnection("Data Source=" + DBConn.ConnectionProperties.ServerName + ";Database=JMSIMG;User ID=" + DBConn.ConnectionProperties.DBUsername + ";Password=" + DBConn.ConnectionProperties.DBPassword + ";Trusted_Connection=False;Integrated Security = true");

                        SqlCommand sqlCommand2 = sqlConnection2.CreateCommand();
                        sqlCommand2.CommandText = "Select GET_FILESTREAM_TRANSACTION_CONTEXT() As TransactionContext";
                        sqlConnection2.Open();
                       SqlCommand("Select GET_FILESTREAM_TRANSACTION_CONTEXT() As TransactionContext")).Tables[0].Rows[0][0];
                        byte[] transactionContext1 = (byte[])sqlCommand2.ExecuteScalar();

SqlFileStream sqlFileStream1 = new SqlFileStream(filePath1, transactionContext1, FileAccess.Write)

byte[] ProductImage = grbPictureBox1.BinaryValue;
sqlFileStream1.Write(ProductImage, 0, ProductImage.Length);
sqlFileStream1.Close();
transactionScope.Complete();
context.Leave();