Incorrect Syntax Near sproc ...

I got this 'incorrect syntax near spoc (stored procedure)' error from the following:

        string connectionString = getConnectionString("ConnectionString");
        SqlConnection conn = new SqlConnection(connectionString);
        System.Data.SqlClient.SqlCommand command = new System.Data.SqlClient.SqlCommand("sproc_aspnet_StocksInLists_RemoveStocksFromList", conn);
        
        try
        {
            conn.Open();
            command.Parameters.AddWithValue("@ListId", ddlList.SelectedValue);
            iRes = command.ExecuteNonQuery();
            if (iRes < 0) throw new Exception("Error removing stocks from list");
        }

The bug fix is to set the command type:

        string connectionString = getConnectionString("ConnectionString");
        SqlConnection conn = new SqlConnection(connectionString);
        System.Data.SqlClient.SqlCommand command = new System.Data.SqlClient.SqlCommand("sproc_aspnet_StocksInLists_RemoveStocksFromList", conn);
        command.CommandType = System.Data.CommandType.StoredProcedure;
        try
        {
            conn.Open();
            command.Parameters.AddWithValue("@ListId", ddlList.SelectedValue);
            iRes = command.ExecuteNonQuery();
            if (iRes < 0) throw new Exception("Error removing stocks from list");
        }